The United States has more than 19,000 airports, which vary substantially in size and the type of aviation services they support. Of these, roughly 3,300 airports are designated by FAA as part of the national airport system and are therefore eligible for federal assistance for airport capital projects. The national airport system consists of two primary types of airports—”commercial service” airports—which are publicly owned, have scheduled service, and board at least 2,500 or more passengers per year—and “general aviation” airports—which have no scheduled service and board fewer than 2,500 passengers. Federal law divides commercial service airports into various categories of airports, based on the number of passenger boardings, ranging from large hub airports to commercial service non-primary airports (see fig. 1). Consistent with our prior work, we have grouped airports into two broader categories: larger airports, which includes large and medium hubs, and smaller airports, which includes small hubs, non-hubs (also referred to as “non-hub primary”), and non-primary commercial service airports as well as reliever airports, general aviation airports, and new airports. The majority of passenger traffic is at larger airports, which accounted for 88 percent of all commercial airport enplanements in 2017. From 2013 to 2017, enplanements have increased at airports of all hub sizes. Specifically, commercial airport enplanements at larger and smaller airports increased by 16 percent and 15 percent, respectively, during this time period. National system airports are eligible to receive federal funding from AIP grants for infrastructure development. AIP funds are first authorized in FAA reauthorization acts, and Congress then appropriates funds for AIP grants from the Airport and Airway Trust Fund, which is supported by a variety of aviation-related taxes, such as taxes on tickets, cargo, general aviation gasoline, and jet fuel. While AIP grants are an important source for airports’ infrastructure funding, the amount of funding authorized for the AIP grant program has not changed since 2012. In 2018, Congress passed the FAA Reauthorization Act of 2018, which authorized annual AIP grant levels at $3.35 billion annually through fiscal year 2023 and authorized additional amounts for supplemental discretionary funding each year from 2019 through 2023, starting at $1.02 billion and increasing each year thereafter. In addition, the Consolidated Appropriations Act of 2018 appropriated $1 billion in supplemental annual funding from the general fund for the AIP discretionary grant program. Subsequently, in February 2019, the Consolidated Appropriations Act of 2019 provided $500 million from the general fund to the AIP discretionary grant program. The distribution of federal AIP grants is complex. It is based on a combination of formula funds—also referred to as entitlement funds—that are available to national system airports, and discretionary funds that FAA awards for selected eligible projects. Entitlement funds are apportioned by formula to airports and may generally be used for any eligible airport improvement or planning project. Discretionary funds are approved by FAA based on FAA selection criteria and a priority system, which FAA uses to rank projects based on the extent to which they reflect FAA’s nationally identified priorities. AIP grants must be used for eligible and justified projects, which are planned and prioritized by airports, included in their capital improvement plans, and reviewed and approved by FAA staff and the Secretary of Transportation. Generally, most types of airfield improvements—such as runways, lighting, navigational aids, and land acquisition—are eligible for AIP funding. AIP-eligible projects for airport areas serving travelers and the general public—called “landside development”—include entrance roadways, pedestrian walkways and movers, and common space within terminal buildings, such as waiting areas. See figures 2 and 3 for more information about the types of projects eligible for AIP funding. For all AIP-funded projects, the airport must provide a share of matching funds. The federal share is from 75 to 95 percent depending on the size of the airport or type of project. Revenue from PFCs is another means of support for airport infrastructure projects. PFCs are federally authorized fees which were established in 1990 to help pay for infrastructure at commercial service airports. Although PFCs are local funds subject to the airport’s control, FAA oversees the PFC program and approves applications by airports to collect PFC revenues. PFCs are currently capped at $4.50 per flight segment with a maximum of two PFCs charged on a one-way trip or four PFCs on a round trip, for a maximum of $18 total. On behalf of the airports, airlines collect the PFC at the time of the ticket purchase and remit the PFC, minus an administrative fee, to the airport. To meet future planned infrastructure costs, airports have sought an increase in the cap on PFCs. However, airlines oppose a PFC increase because they believe airports already receive sufficient PFC revenues and that higher ticket prices could reduce passenger demand and airline revenues. We have previously reported that increasing the PFC cap would significantly increase PFC collections available to airports under three scenarios GAO modeled but could also marginally slow passenger growth and growth in revenues to the Airport and Airway Trust Fund (AATF). Airports have more flexibility in using PFCs to fund infrastructure projects as compared to AIP funding. Airport infrastructure projects eligible for PFC funding must meet one or more of the following: preserve or enhance safety, security, or capacity; reduce noise or mitigate noise impacts; or increase air carrier competition. Airports are able to fund projects with PFC revenues that might not be eligible for AIP funding, such as passenger terminal projects and development at gates, airline ticketing areas, and passenger check-in facilities at hub airports. In addition to being applied to FAA approved eligible projects, PFCs can be used as a match for AIP grants or to finance the debt on approved projects. FAA and ACI-NA each produce reports summarizing 5-year estimates of U.S. airports’ infrastructure project costs. More specifically, FAA is required to publish a 5-year estimate of AIP-eligible development every 2 years. FAA provides this information in its NPIAS report. FAA relies on airports, through their planning processes, to identify individual AIP- eligible projects for funding consideration and inclusion in the NPIAS. The ACI-NA also collects data on all proposed capital development projects at U.S. airports and every 2 years publishes a report of U.S. airports’ 5-year infrastructure cost estimates. From fiscal years 2013 through 2017, national system airports received an annual average of about $15 billion in funding from a variety of sources for infrastructure development projects, including: federal AIP grants (about $3.2 billion annually); airport revenue from passenger charges (about $3.1 billion annually), and airport-generated revenue (about $7.7 billion annually); and capital contributions (about $715 million annually). These figures, however, do not represent the full amount of funding that is available to airports for infrastructure development. For example, some airports also received funding from state grants and bond proceeds through debt financing to fund airport infrastructure investments. In addition, the proportion of funding that larger and smaller airports received from these sources varies. From fiscal years 2013 through 2017, the total amount of AIP grants that national system airports received has generally remained constant. As shown in figure 4 below, the amount of AIP grant funding that airports received ranged from $3.1 billion to $3.3 billion annually for fiscal years 2013 through 2017. Overall, airports received an average of $3.2 billion annually in AIP grants. The total amount of AIP grant funding that FAA allocates to airports may vary slightly year to year for many reasons. For example, according to FAA, each year a small amount of AIP funding is returned from prior-year grants and the FAA is permitted to re-obligate those funds on either existing or new grants. Collectively, smaller airports received more AIP grant funding compared to larger airports during this time period. As shown in figure 4, from fiscal years 2013 through 2017, smaller airports received the largest share of AIP grant funding, approximately 75 percent, (an annual average of $2.4 billion), compared to 25 percent received by larger airports (an annual average of $812 million). Larger airports are generally able to rely on other sources of revenue generated from airport-generated revenue and PFCs due to higher enplanements compared to smaller airports. In addition, the amount of AIP grants’ funding that smaller hub airports received increased by about 10 percent between fiscal years 2013 through 2017, while the amount of AIP’s funding for larger airports decreased by 3 percent in the same time period. However, smaller airports receive less funding per AIP grant compared to larger airports. For example, smaller airports received an average of $897,000 per grant, while larger airports received an average of $5 million per AIP grant. Some airports also received state funding, primarily in the form of grants used as matching funds for federal AIP grants. Data for fiscal years 2013 through 2017 on states’ grant funding are not available. However, in 2015, we conducted a survey of airports, in collaboration with NASAO, for fiscal years 2009 through 2013, and reported that states provide an annual average of $477 million to national system airports. According to NASAO officials we interviewed for our current work, states’ grant-funding levels have remained unchanged. From fiscal years 2013 through 2017, airports collected revenue from a variety of sources, including PFC charges and airport-generated revenue (both aeronautical and non-aeronautical), which have both increased during our 5-year time period. Some airports also received funding from capital contributions, but that amount has decreased from fiscal year 2013 through 2017. Airport revenue is the largest source of funding for larger airports. Specifically, larger airports generated an annual average of $10.4 billion in airport revenue (or 90 percent of all airport revenue) during our 5-year time period. Smaller airports generated less airport revenue, with an annual average of $1.2 billion (or 10 percent of all airport revenue), compared to larger airports. Larger airports’ ability to generate more airport revenue reflects that PFCs and airport-generated revenue could be driven by the higher levels of passenger enplanements and airline activity associated with current economic conditions. According to FAA officials, while total airport revenue has increased over this time frame, it does not necessarily mean that airports have more revenue available for new capital expenditures. For example, airport revenue is also used to pay for existing debt service and operating costs, which according to FAA officials, has also increased during this time period. Overall, from fiscal years 2013 through 2017, U.S. airports collected an annual average of $3.1 billion in PFC revenue. As shown in figure 5, during this period, the annual average for PFC collections for all airports increased by 9 percent from $3 billion to $3.3 billion. Because PFCs are generated by the number of enplaned passengers, this increase was mostly driven by a 16 percent increase in passenger enplanements during this period for both smaller and larger airports. As shown in figure 5, larger airports collected most (89 percent) of the PFC revenues in fiscal years 2013 through 2017. In addition, although both larger airports and smaller airports experienced an increase in passenger enplanements in fiscal years 2013 through 2017, larger airports experienced a 10 percent increase in PFC revenue while smaller airports experienced an overall decrease in PFC revenue during this period of about 3 percent. According to FAA officials, smaller airports may have experienced an overall decrease in PFC revenues because airports’ PFC collections may cease when they have fully collected the approved amount for a project. According to FAA, this cessation is particularly true for smaller airports that do not have multiple projects for which PFC collections have been approved for a long period of time. In addition, if an airport has approved collections but one or more airlines make significant reductions in activity levels, this factor can also slow the rate of collections at airports. Larger airports hold a larger market share of flights, representing 88 percent of enplanements. Ratings agency representatives said that larger airports rely more on PFCs and bonding to fund infrastructure projects. From fiscal years 2013 through 2017, U.S. airports generated an annual average of $7.7 billion in airport-generated revenue. During this period, airport-generated revenue increased 18 percent, from $7.1 billion to $8.4 billion for all airports. Overall, both larger and smaller airports generated more income over this time period, with larger airports generating substantially more revenue compared to smaller airports. Specifically, from fiscal years 2013 through 2017, larger airports generated an annual average of $7.1 billion in revenue, and smaller airports generated an annual average of $567 million in revenue. Airport-generated revenue consists of both “airside” aeronautical revenues derived from the operation and landing of aircraft, passengers, or freight, as well as “landside” non-aeronautical revenues derived from terminal concessions and parking fees. Of the $103 billion in airport- generated revenue over our 5-year time period, 54 percent came from aeronautical revenues and 46 percent came from non-aeronautical revenues (see fig. 6). Commercial service airline rates and charges— which include passenger airline’s landing fees and passenger arrival fees, rents, and utilities—made up 75 percent of the total $55.9 billion in aeronautical revenue. The remainder came from a variety of other fees and taxes paid by airlines, general aviation, the military, and other aeronautical sources. Of the non-aeronautical revenues, parking and ground transportation accounted for the greatest portion (41 percent), followed by rental cars operations revenue (19 percent). Aeronautical revenues increased by 11 percent and non-aeronautical revenues increased by 16 percent over the time period. Capital contributions for airport infrastructure projects make up a small amount of funding in comparison to other sources, such as airport- generated revenue and AIP funding. These contributions—made on an individual project basis—may be provided by an airport’s sponsor (often a state or municipality) or by other sources such as an airline. According to FAA data on commercial airports’ annual financial reports for fiscal years 2013 through 2017, commercial airports received an annual average of $715 million in capital contributions. Of this amount, $471 million, or 66 percent, went to larger airports, and $244 million, or 34 percent, went to smaller airports. The amount of capital contributions varies by year and by hub size. According to FAA officials, the sources of capital contributions funding (i.e., airport sponsor, state, air carriers, or other airport users) vary depending on the type of project and funds available. Airports can also obtain financing for airport infrastructure projects by issuing bonds. Airport bonds entail leveraging future funding to pay for projects. This financing mechanism enables airport authorities to borrow money up front to finance infrastructure projects; this money can then be paid back with interest over a longer time period. U.S. airports may qualify for tax-exempt bonds to support airport projects for federal tax purposes because the airports are owned by states, counties, cities, or public authorities. The tax-exempt status enables airports to issue bonds at lower interest rates than taxable bonds, thus reducing a project’s financing costs. FAA officials said that because airports use some PFCs and airport-generated revenue to pay off debt service, not all revenue generated from these two sources is available for additional infrastructure investment. FAA collects data in its financial reporting database of an airport’s total indebtedness. Based on our analysis of this data, from fiscal years 2013 through 2017, airports had averaged $84.6 billion in total bond debt per year. The total indebtedness measure provides an overall aggregate of the level of long-term bond debt held by airports for the year. FAA’s data do not differentiate indebtedness for each type of bond, nor do its data differentiate between existing, new, or refinanced bonds. As a result, we were not able to analyze how much airports obtained on average for new projects by issuing bonds from fiscal years 2013 through 2017. In addition, we were not able to determine whether U.S. airports borrowed increasing amounts of new bond proceeds from fiscal years 2013 through 2017 to meet infrastructure needs. Moreover, FAA does not collect data on the time frame that airports anticipate to pay back bonds, as FAA officials said that airports have the latitude to determine their own debt- payment schedules. During fiscal years 2013 through 2017, larger airports received the vast majority of bond proceeds, representing 95 percent of the total (see fig. 7). This amount includes debt from all long-term bonds. We previously reported that bond financing has traditionally been an option more commonly exercised by larger rather than smaller airports because they are more likely to have a greater and more certain revenue stream to support debt repayment. We have also reported that when smaller airports issue bonds, they make greater use of general obligation bonds that are backed by tax revenues of the airport sponsor, which is often a state or municipal government. FAA officials added that larger airports tend to issue airport revenue bonds, which are backed solely by airport revenue, while some smaller airports may be able to benefit from bond proceeds issued by the broader county or municipal government and backed by that entity's taxing authority. Based on our analysis, airports’ planned infrastructure costs are projected to average $22 billion annually for fiscal years 2019 through 2023. To arrive at this estimate, we combined FAA’s $7 billion estimate of AIP- eligible planned infrastructure costs and ACI-NA’s $15 billion estimate of planned infrastructure costs for projects that are not eligible for AIP grants. Our $22 billion estimate would represent an increase of 19 percent from FAA’s and ACI-NA’s fiscal years 2017 through 2021 infrastructure cost estimates. This increase is largely driven by an increase in ACI-NA’s estimate of AIP-ineligible planned projects. Specifically, ACI-NA’s annual average of about $15 billion in planned AIP- ineligible costs reflects an increase of $3.3 billion or 28 percent when compared to the annual average estimate of AIP-ineligible projects from ACI-NA’s fiscal year 2017–2021 estimates. Similarly, FAA’s annual average of $7 billion in planned AIP-eligible costs reflects an increase of $289 million or 4 percent from FAA’s fiscal year 2017–2021 estimates. A variety of factors may be contributing to the increase in FAA’s and ACI- NA’s cost estimates, factors that we will discuss later in the report. Overall, larger airports (large and medium hub) accounted for 75 percent of the $22 billion annual cost estimate and make up a greater percentage of the estimated increase in planned development costs when comparing the fiscal years 2017 through 2021 and fiscal years 2019 through 2023 estimates. For example: Among planned AIP-eligible projects, estimated annual planned- development costs increased from $1.4 to $1.7 billion (an 18 percent increase) for large hub airports and from $641 to $735 million (a 15 percent increase) for medium hub airports, according to FAA’s cost estimates. By comparison, estimated planned development costs for small hub and non-hub airports decreased by 3 and 2 percent respectively over the same time period. Among AIP-ineligible projects, ACI-NA estimates show that annual planned development costs increased more significantly for medium hub airports. Specifically, ACI-NA’s report shows that annual planned development costs for AIP-ineligible projects increased by 22 percent for large hub airports, 71 percent for medium hub airports, and 29 percent for small hub airports. ACI-NA representatives stated that the increase in medium hub airport’s planned development (for both AIP-eligible and AIP–ineligible projects) is due to the underinvestment at medium hub airports in prior years. Specifically, ACI-NA representatives stated that in response to the loss of air service immediately following the 2007–2009 recession, some medium hub airports scaled back their capital investments. ACI-NA representatives stated that as passenger traffic has recovered with economic growth, medium hub airports are now investing in previously deferred improvements. According to ACI-NA’s report on airports’ capital development needs for 2019–2023, medium hub airports–such as Austin- Bergstrom International Airport (Austin airport), Norman Y. Mineta San Jose International Airport, and Dallas Love Field Airport–are undertaking major infrastructure improvement programs. According to officials from Austin airport, the airport recently completed a 10-year plan for its capital development program, with an estimated cost of $3.5 billion, for a new terminal, concourse, airfield improvements, runway improvements, and improved landside access. Austin airport officials stated that the airport is 20 years old and nearing the end of its lifecycle, and airport officials are trying to manage aggressive growth while rebuilding the airport. The sources of funding and types of infrastructure projects that smaller and larger airports have planned also differ. For example, smaller airports have more AIP-eligible planned costs compared to larger airports, according to FAA cost estimates. Specifically, smaller airports accounted for about $4.6 billion (or 66 percent) of AIP-eligible project costs for all airports but, according to ACI-NA cost estimates, only $878 million (6 percent) of AIP-ineligible projects. In addition, among AIP-eligible projects, while the top four types of infrastructure projects that larger and smaller airports have planned are similar (see table 1), estimated costs are more concentrated among the top two project-type categories for smaller airports. Specifically, reconstruction projects, which are projects to replace or rehabilitate airport facilities such as runways, and projects to meet FAA standards for airport design represented about 79 percent of smaller airports’ AIP-eligible estimated project costs. ACI-NA’s data do not break out AIP-ineligible project costs by project type. As a result, we were not able to determine what types of projects constitute the largest shares for AIP-ineligible project costs. However, ACI-NA does provide information about project type across all the projects in its cost estimate. According to ACI-NA’s representatives, the types of projects that are generally not funded with AIP grants that airports need to fund include landside projects, such as terminal projects; rental car and parking facility projects; concession redesign projects; and airport access projects. The increase in planned infrastructure costs for fiscal years 2019 through 2023 can be attributed in part to an increase in planned terminal projects during this 5-year time period. Specifically, both FAA’s and ACI-NA’s cost estimates show an increase in planned terminal projects. For example, according to FAA’s estimates of planned projects funded by AIP grants, terminal projects now represent the third largest share of total estimated costs from fiscal years 2019 through 2023 and experienced the greatest percentage increase over the previous 5-year period. As shown in table 2, overall annual average cost estimates for terminal projects increased by 51 percent between the two periods. Environmental projects was the only other project category that had significant increases (about 38 percent), while estimated costs for many other types of projects decreased. According to FAA officials, the increase in environmental projects is due to increases in environmental-related NPIAS costs (such as mitigation of development impacts and costs for environmental studies) at large and medium hub airports and additional noise mitigation at hub airports. Similarly, according to ACI-NA’s analysis, for fiscal years 2019 through 2023, terminal projects represented 53 percent of the total infrastructure- development costs among both AIP-eligible and AIP-ineligible projects. Terminal projects included terminal building projects (37 percent) and projects to provide access to the terminal (16 percent). FAA and ACI-NA representatives stated that terminal projects can be more expensive than other types of projects because of the scale of these improvements. For example, terminal projects may involve complex vertical construction, an array of special systems such as baggage and passenger screening systems, and integration of security and access control systems, all of which can contribute to the overall higher cost of these projects. In contrast, runway and airfield infrastructure generally rely on common design standards and standard construction methods according to ACI- NA representatives. Additionally, officials from most (16 out of 19) of the airports that we spoke to stated that they are planning terminal improvement projects over the next 5 years. Officials from these airports told us they are focused on making terminal improvements because existing terminals are aging and in need of repairs and to accommodate an increase in passenger enplanements due in part to airlines using larger aircraft holding more passengers. Examples of planned terminal projects at selected airports and factors contributing to these investments are below. Large hub airport terminal project. Officials from a large hub airport that we spoke to stated that they have two ongoing major terminal projects. The first project will expand and renovate the airport’s north terminal. The 468,000-square-feet facility will include a new upper- level mezzanine, seismic upgrades, and an upgraded baggage- handling system, among other improvements. According to airport officials, capacity constraints and the age of the terminal were factors for renovating the terminal. Phase 1 of the project began in February 2017 and was completed in mid-2019. As of July 2019, nine gates are operational. The second phase of construction is expected to be completed in mid- 2021. The estimated cost of the project is projected at $658 million. The airport is also developing a new international arrivals facility at its airport. According to airport officials, this facility is intended to significantly enhance the international passenger experience, and improve the arrival process for international passengers without adding new gates. Airport officials stated that the current facility is not able accommodate the city’s growing demand for international travel. The facility is estimated to cost about $968 million and is expected to open in the fall of 2020. Medium hub airport terminal project. According to officials from a medium hub airport, growth in passenger traffic is driving the need for a new terminal at that airport. International traffic at the airport has tripled between 2012 and 2017, with airlines adding three new service destinations to Europe. According to airport officials, the existing terminal will soon reach its capacity to handle international arrivals, and the first phase of the terminal project was substantially completed in 2019 and cost about $350 million. Small hub airport terminal project. Officials from a small hub airport stated that airlines have started replacing existing aircraft with larger aircraft, and this process has placed capacity constraints at their terminal. The terminal was built in 1948, and the passenger waiting area was built in the 1960s when airlines providing service to the airport were using aircraft with 100 seats. Now, however, airlines are using larger aircraft, which can accommodate up to 180 seats. Airport officials stated that they are beginning construction of a new terminal, which will expand passenger capacity at the airport. The overall estimated costs of the terminal project are $513 million, and the project is expected to be completed in 2028, pending additional funding. FAA officials and ACI-NA representatives agreed that the increased focus on terminal projects is due in part to airlines changing their business models and aircraft fleets and an increase in passenger traffic. The officials stated that as part of the industry’s fleet rationalization efforts, airlines are eliminating some smaller aircraft and replacing them with larger aircraft to increase passenger-seating capacity. FAA officials added that passenger growth at large and medium hub airports is also contributing to the increase of AIP-eligible terminal costs, as airports need to expand terminals to add capacity. According to FAA, terminal projects at large and medium hubs are generally funded through PFCs and other funding sources rather than through AIP funding. For its 2019–2023 NPIAS report, however, FAA officials said they asked airports to provide information about AIP-eligible projects regardless of whether they were planning to apply for AIP funding for the projects. According to FAA officials, this factor may also have contributed to the apparent increase in AIP-eligible terminal costs. According to FAA, another factor driving the increase in terminal costs is that seven airports have planned major terminal projects over the next 5 years. The costs of these projects are reflected in FAA’s AIP-eligible cost estimate. In addition to an increased focus on terminal projects, FAA officials, ACI- NA representatives, and selected airports cited other factors that are contributing to an increase in infrastructure costs estimates, such as increased construction costs, an overall healthier economy, increased traffic, airline consolidation, and airlines’ strategic shift to focus on hub operations. For example, according to Nashville International Airport’s officials, a growing economy has resulted in more competition for construction materials and skilled workers, competition that has increased construction costs in the Nashville area and has resulted in higher airport development costs. According to ACI-NA representatives, other larger cities such as Salt Lake City, Los Angeles, and Seattle have also reported cost escalation in their construction markets. Officials from most (18 out of 19) selected airports we interviewed stated that the funding and revenue available to them from existing funding sources—such as AIP grants and PFC revenues—may not be sufficient to cover the costs of future and planned infrastructure projects. For example, 14 airport officials we spoke to stated that the amount of funding that they have received in the past and that they anticipate receiving in the future from AIP formula or discretionary grants will not be sufficient to cover the costs of their future planned AIP-eligible projects. Airports may use a variety of other funding sources to pay for AIP-eligible projects. As such, differences between available AIP funding and AIP-eligible cost estimates do not necessarily reflect a funding shortfall. In addition, the NPIAS estimates represent planned AIP-eligible project costs and do not reflect actual expenditures. Below are some examples of AIP-eligible projects that airport officials stated will be a challenge to complete without additional funding: Airfield safety projects. Officials from a small hub airport stated that they have two major airfield-safety projects planned that are intended to align their airport’s current runway and taxiway to FAA safety standards. According to airport officials, their airport has been on the FAA’s top-10 list of airports with highest “incursions” for 4 consecutive years, and officials stated these airfield improvements would help them mitigate runway incursions at their airport. According to airport officials, these projects are expected to cost about $230 million, which they stated is a significant cost for an airport of their size. Their primary source of funding is AIP funding and PFC revenues; however, their current AIP formula funding and PFC revenues are not sufficient to cover the cost of the projects. Without additional funding, officials said that they will need to complete the project in phases, which could lead to a multi-year project ranging from 4 to 12 years to complete. Airport officials stated that a multi-year project of this length would significantly affect their airport operations and increase overall costs. They also stated that ideally, it would be most efficient to execute the project in fewer phases to reduce costs and to benefit airport users, as construction may negatively affect airport operations. Runway rehabilitation project. Similarly, officials from another small hub airport said their airport receives about $5 million annually in AIP formula funding, which they said is not sufficient to cover the costs of their planned runway pavement rehabilitation and reconstruction project. The total cost of the project is about $20 million. According to airport officials, if they are unable to find alternate sources of funding for the project, they will have to postpone the runway project, and such a postponement would have a significant effect on their airport operations. Runway replacement project. Officials from a medium hub airport are planning to invest in a new runway project that is expected to cost about $350 million. The existing runway is nearing the end of its useful life and needs to be replaced. They anticipate receiving approximately $4.5 million annually in AIP formula funding and plan to apply for discretionary AIP funding as well. They stated that currently, this airport’s PFC revenues have been obligated until 2032 and that therefore, they are not able to use this funding source to pay for the runway. According to airport officials, without these funding sources the airport will be required to use their existing bonding capacity to pay for this critical infrastructure, a move that would reduce their future bonding capacity for future critical infrastructure improvements. Fourteen airport officials also stated that revenue generated from PFCs is also not sufficient to cover the costs of planned infrastructure. For example, officials from one large hub airport stated that they have been successful in being able to keep up with the pace of growth at their airport, but based on their forecasts, they anticipate that they would be unable to meet infrastructure demands without an increase in PFC funding. Officials from six airports stated that because the PFC cap has remained at $4.50 since 2000 and has not been adjusted for inflation, the value of the PFC has decreased. In 2015, we reported that an inflation adjusted PFC cap would be $6.46. Representatives from eight airlines that we spoke to, however, disagree that the PFC cap should be increased citing increases in passenger traffic, increases in PFC revenues, and availability of other adequate sources of funding. According to FAA officials, increases in passenger traffic and other changes have also increased the need for capital facility investments. Officials from about half of the airports (nine out of 19) that we spoke to— including a mix of smaller and larger airports—stated that that the revenue their airport generates from PFCs are already obligated toward current infrastructure projects, which they stated could affect their ability to use debt financing for future infrastructure projects. An additional three airports we spoke to stated that they plan to use PFC revenues to finance planned infrastructure projects and that they anticipate that these revenues will be obligated over a long term period—about 30 years— limiting their ability to use debt financing for other projects. FAA’s financial data show that airports committed a significant share of their PFCs to debt service during fiscal years 2013 through 2017. Specifically, of the $16 billion in PFC revenues (or an annual average of $3.1 billion) collected in fiscal years 2013 through 2017, airports paid a total of $12 billion for debt service (or an annual average of $2.5 billion)— which is about 78 percent of total PFC revenues generated during this time period. The debt service includes payments on new bonds, existing bonds, and refinanced bonds which, as previously noted, are collectively tracked in FAA’s database. As shown in figure 8, over our 5-year time period, larger airports accounted for the vast majority (over 90 percent) of the PFCs dedicated to debt service. According to ACI-NA’s report on airports’ capital development needs for 2019–2023 and some selected airport officials, because airports have already committed a significant portion of their current and future PFCs to servicing debt on current or completed projects, airports will have less PFC funding available for future projects. According to ACI-NA’s report on airports’ capital development needs for 2019–2023, the entire national airport system is carrying a combined debt of $91.6 billion from past projects and may be unable to pay for future needed projects unless the existing cap on PFCs is increased. Officials from three small hub airports stated that they are currently facing challenges obtaining financing for infrastructure projects, because they are already fully leveraged and have pledged their PFCs over the mid- to long-term. For example, officials from a small hub airport said that they obtained $120 million in financing, which will be carried until 2040, to build a parking garage and concourse. They said that because the airport is at capacity for debt issuance, they cannot take on any new debt for additional infrastructure projects. FAA data show that as of August 2019, 117 airports (about 30 percent) have obligated their PFCs past 2030 and that 30 airports (about 8 percent) have obligated their PFCs past 2040. One airport has obligated its PFCs through 2070. While some airports we spoke to raised concerns about being able to use debt financing for future airport-infrastructure projects, representatives from two rating agencies that we spoke to stated that for the airports they rate, the bond market is currently favorable, allowing for easier and economical access to financing. Rating representatives stated that currently, the outlook for domestic airports is either stable or positive due to the fact that airport passenger traffic growth has exceeded the gross domestic product’s growth, and airport ratings have remained consistent. For example, according to one rating agency, since 2012, its airport ratings have remained consistent and the annual airport outlook in those years has been “stable” or “stable to positive.” FAA officials added that while the perspective of rating agencies, bond insurers, and underwriters are important, a favorable credit rating does not mean that an airport should make the decision to take on additional debt. Moreover, according to FAA officials, for airports that need airline approval to issue debt, a favorable credit rating may not be sufficient to persuade the airlines of the need for the additional investment. Officials from 13 airports we spoke to stated that they are taking several actions to address funding challenges. These airport officials stated that they have deferred or delayed infrastructure investments, completed projects in phases in order to be able to fund projects in stages, or are looking for other ways to generate airport revenues from passenger services or leases. For example, officials from one airport we spoke to stated that their airport has developed a strategy of breaking up infrastructure projects into phases so as to utilize available FAA funding. According to these airport officials, this strategy lengthens the construction time and results in higher construction costs, but helps the airport to align its project needs with available FAA funding. Another airport official we spoke with said that the airport is introducing a dynamic- pricing parking program to generate additional parking revenue and that the program is expected to bring in an additional 5 to 15 percent in parking revenue. Officials from about half (11 out of 19) of our selected airports stated that AIP’s eligibility funding criteria are too narrow and do not allow airports to fund the infrastructure projects that they currently need, such as terminal projects. FAA’s AIP handbook provides guidance on the criteria to determine which components of a project are eligible for AIP funding. AIP-eligible projects, outlined in statute, include airport planning, airport development, noise compatibility planning, and noise compatibility projects. Certain airport projects, such as revenue-producing parking facilities, hangars, revenue portions of terminals, off-airport roads, and off-airport transit facilities are not eligible for AIP funding. Some terminal projects, however, are eligible for AIP funding, such as a terminal structure shell’s development and development of public use areas directly related to the movement of passengers and baggage in terminal facilities within an airport. This eligibility includes public use spaces that passengers may need to occupy as part of their air travel or utility support space needed to make the public space operational, including the mechanical and electrical rooms. Four airport officials we spoke to stated that they have infrastructure projects planned that are eligible for AIP discretionary funding, but that due to FAA’s criteria for AIP discretionary funding and FAA’s process for prioritizing projects, it is difficult for airports to receive discretionary funding for these projects. According to FAA officials, the eligibility criteria for AIP projects funded through entitlement and discretionary funding are the same. Discretionary funding, however, has some additional restrictions. For example, large, medium, and small hub airports are not eligible to use discretionary funding for terminal building projects. General aviation airports, however, may use discretionary funding for some airport terminal projects. In addition, unlike with entitlement funding, discretionary funding is not reimbursable and airports cannot apply for discretionary funding for projects that have already begun construction. In addition, unlike entitlement funding, not all airports receive discretionary funding. Airports must compete for the limited amount of discretionary funding available each year based on FAA’s AIP prioritization. According to FAA officials, while discretionary funding criteria do not change year to year, FAA may fund projects with discretionary funding one year, but a similar project may not receive discretionary funding a different year due to the project mix that year. FAA officials also stated that in September 2019, FAA updated its Formulation of the NPIAS and Airports Capital Improvement Plan order, which lays out the criteria and prioritization process for selecting projects for discretionary funding. According to FAA officials, projects with the highest priority include safety- and runway-related projects, such as runway signage or resolving complex geometry causing runway incursions. FAA officials stated that other projects have lower priority and ranking in the AIP discretionary-funding prioritization process. Below are examples from airport officials that stated they have certain projects planned that are eligible for AIP discretionary funding but that they believe will likely not rank high in FAA’s prioritization: Non-airfield projects. According to officials from a large hub airport we interviewed, the airport has made several investments in their airfield in the last few years and does not have any major airfield projects planned. These officials stated that they do have several non- airfield projects planned that are AIP-eligible, such as renovating gate holding areas in the terminal. However, airport officials stated that non-airfield projects do not compete well for AIP discretionary funding based on FAA’s prioritization process. As a result, they do not anticipate that they will receive AIP funding for these projects. Airfield projects. Similarly, airport officials from one medium hub airport explained that some of the airfield projects that they have planned, are eligible for AIP discretionary funding, but are not considered “high priority” projects according to FAA prioritization criteria. For example, they currently have a taxiway and apron upgrade project planned, but this project may not compete well against other projects when considering FAA’s AIP prioritization process. According to this airport official, runways are the highest priority and almost always get AIP funding. The official added, however, that the farther away you get from the runway, the less likely it is that you will be able to get AIP funding for the project. In addition, five airport officials noted that while overall AIP grant-funding levels have remained relatively constant in recent years, demand for discretionary AIP grant funding has increased, thereby increasing competition for this funding. According to FAA officials, the amount of funding that FAA has available for discretionary grants changes year-to- year. For example, the amount of discretionary funding allocated to airports annually can vary based on an airport’s decisions to carry entitlement funding over multiple years, as entitlement funding that is carried over becomes discretionary. According to FAA officials, because a very high percentage of discretionary funding comes from funding that has been carried over, it is difficult for airports to plan for or count on this funding being available in any given year. Between fiscal years 2013 through 2017, the amount of discretionary funding that was awarded averaged $1.6 billion annually. Of this amount, the amount representing “pure” discretionary funding averaged $56 million annually or about 4 percent of total AIP discretionary funding. Pure discretionary funding refers to the amount remaining after discretionary set-asides have been funded. FAA distributes pure discretionary funding to eligible projects at any airport on a competitive basis. As previously discussed, an additional $1 billion in supplemental discretionary AIP funding was appropriated in 2018, and an additional $500 million was appropriated in discretionary AIP funding in 2019. However, according to FAA officials, the number of applications they received for this funding exceeded the amount of funding that was available. Specifically, according to officials, FAA received more than 2,500 funding requests totaling more than $10 billion in 2018 for the $1 billion authorized as supplemental discretionary AIP grant funding. As of May 2019, FAA has awarded or anticipates awarding $985 million in supplemental discretionary AIP grant funding to 164 airports in 50 states, the District of Columbia, and Puerto Rico. The supplemental grants fund projects ranging from runway reconstruction and rehabilitation, to the construction of taxiways, aprons, and terminals. About half (12 out of 19) of the airport officials we spoke to stated that competing airport and airline priorities for capital infrastructure investments can pose challenges to funding infrastructure projects and can delay projects. For example, some of these officials stated that if an airline does not agree that there is a business case or that an infrastructure project is justified, then that lack of agreement can affect the airport’s ability to fund the project or delay the project altogether. The extent to which airlines are involved in the decision-making of airport infrastructure investments varies by airport and depends on the type of “use-and-lease” agreement between the airport and the airline. These agreements set forth the terms and conditions for establishing airline rates and charges and investing in capital improvements. Some agreements have a “majority-in-interest” (MII) provision, which requires airports to obtain airlines’ approval for certain infrastructure investments. One large hub airport stated that they have an MII agreement, requiring airlines’ approval of certain projects and project financing strategies. They further explained that debt financing would affect their airline rates and charges and would therefore require the airport to obtain approval from airlines before using general airport-revenue bonds on a project. While airport officials would like to add more gates to the airport and finance that project with general airport revenue bonds, these officials stated that some airlines may not support unassigned gate additions because it could increase competition. According to FAA officials we spoke with, some airports have been able to move toward shorter-term agreements with greater flexibility to adapt to changing needs; however, many agreements still include some form of MII provisions. According to officials from four smaller airports, airlines are less likely to support infrastructure-related increases in airline rates and charges at smaller airports than at larger airports. For example, a non-hub airport stated that smaller airports have a more difficult time negotiating higher rates and charges with airlines because of competition from other nearby airports. ACI-NA representatives also stated that medium hub airports that are not connecting hubs for the three large U.S. network airlines have less of an opportunity to receive capital investments from network airlines compared to larger airports. Representatives from all eight airlines that we spoke to stated that the types of airport infrastructure projects that they see a need for are demand-driven infrastructure development projects that expand airfield capacity, increase the number of gates at an airport, or address safety. Of these airlines, six also stated that they see a need for infrastructure development at larger airports in particular. For example, representatives from one airline stated that they want to collaborate with airports on capital development projects that are scalable and where passenger enplanements are increasing. In addition, representatives from five airlines that we spoke to said that they would like to have more input on airport infrastructure investment decisions. In addition, representatives from five airlines raised concerns that airlines do not have a role in decisions on how airports can invest PFC revenues. According to our prior work, PFCs provide airports a source of funding for airport development over which they have greater local control and airlines have more limited say in their use as compared to the use of airport terminal rents or landing fees. In addition, representatives from two airlines we spoke to said that FAA exercises limited oversight of infrastructure projects funded by PFCs, and that this limited oversight results in airports’ using PFC funding for projects that airlines do not see a need for. The representatives stated that FAA largely approves most PFC applications for projects and that they believe FAA should do more to ensure that airports are not using PFC revenues for unnecessary capital development not supported by airlines. For example, one airline objected to the use of over $1.5 billion of PFC funds for the multi-phase construction of the Phoenix Sky Train linking light rail, parking, and terminals, as representatives believed that there was not an adequate business case to justify the construction of the Sky Train. According to these airline officials, because the airport used PFC revenues for the project, other necessary terminal improvements have been largely debt funded. According to FAA officials, when reviewing PFC applications, they assess the extent to which the airport has demonstrated a need for the project. FAA officials stated that airports are familiar with FAA criteria and will generally not submit projects that will not meet the criteria and that could be denied. In addition, FAA officials stated that while it is unusual for FAA to deny an application, they have denied individual projects. We provided a draft of this report to the Department of Transportation (DOT) for review and comment. DOT provided technical comments, which we incorporated as appropriate. We are sending copies of this report to the appropriate congressional committees, DOT, and other interested parties. In addition, the report is available at no charge on the GAO website at http://www.gao.gov. If you or your staff have any questions concerning this report, please contact me at (202) 512-2834 or krauseh@gao.gov. Contact points for our Offices of Congressional Relations and Public Affairs may be found on the last page of this report. GAO staff who made key contributions to this report are listed in appendix III. Traditionally, airports around the world were primarily owned and managed by national governments, but that has changed over time. Beginning in the 1980s and through the 1990s, governments outside of the United States began shifting toward privatization and deregulation of airports. According to the 2016 Airports Council International - World’s (ACI-World) inventory of privatized airports worldwide, 614 commercial service airports (14 percent) have private sector participation. Although ACI-World estimates that a majority (86 percent) of the 4,300 airports with scheduled traffic around the world are publicly owned by a government or government entity, airports with private sector participation handle over 40 percent of all global air traffic. Today, there is a range of airports’ ownership and operating models. Through a literature review of ACI-World’s, the Airports Council International - EUROPE’s (ACI- EUROPE), the International Civil Aviation Organization’s, and the International Air Transport Association’s reports and other documents, we identified five general types of airport ownership structures outside of the United States: Government owned and operated: The airport is fully owned and operated by a public authority or by a mixture of public authorities at a local, regional, national, or transnational level. Government owned and privately operated: The airport is government owned but the airport operator—considered as the entity that is responsible for the day-to-day operation of airport services and facilities—is a private company. Partially privatized: The airport is partially privatized (e.g., mixed public-private ownership), meaning the airports’ shares are owned by a combination of private investor(s) and public authorities of the country where the airport is located. Fully privatized: The airport is fully owned and operated by a commercial company wholly owned by private individuals or enterprises. Not-for-profit, private corporation: The airport has been transferred to or leased by a not-for-profit corporation. The not-for-profit corporation is expected to be financially self-sufficient and fully responsible for funding all operating and infrastructure costs. While U.S. airports are predominantly publicly owned and operated, private participation, like private ownership or private operation contracts, is more common at airports in other countries. Airport Ownership in the United States In the United States, nearly all of the 3,330 commercial-service or general-aviation airports, designated as part of the national airport system, are publicly owned by local and state governments, regional airport authorities, or port authorities. Airport ownership in the United States has evolved under a public model since the 1920s as a way to promote the development of the U.S. aviation industry. In 1996, the Federal Aviation Reauthorization Act of 1996 established the Airport Privatization Pilot Program, which reduced some of the barriers to privatizing airports, and allowed for commercial service airports to be leased and for general aviation airports to be sold or leased. However, as we have previously reported, 18 years following the program’s inception, two airports have privatized, with one of these airports reverting to public control. While participation in the Airport Privatization Pilot Program has been very limited, some airports have entered into public-private partnerships with private entities through management contracts for terminals, which may be leased or outsourced to airlines or other contractors, or for food, rental car, and other concession agreements. For example, the Paine Field Snohomish County Airport in Washington, previously a general aviation airport, entered into a ground-lease agreement with a private airport developer—Propeller Airports—to build and operate a small passenger terminal for commercial service. The terminal was open for commercial service in March 2019, and is depicted in figure 9. Propeller Airports is responsible for the landside infrastructure investments and terminal maintenance. Snohomish County is responsible for maintaining and operating the airside infrastructure, which includes the runways and taxiways, but leases the aprons and the terminal land to Propeller Airports. Airport Ownership in Other Countries Privatized airports are more prevalent in foreign countries. According to a 2016 report by ACI-EUROPE, which examined ownership structures of airports across Europe, about 41 percent of European airports are fully privately owned or partially privatized. According to ACI-World, 75 percent of airports with passenger traffic in Europe have private sector involvement through fully privatized airports or public-private partnerships. Latin America-Caribbean airports (60 percent) and Asian airports (45 percent) have the second and third highest private sector involvement. Industry stakeholders we interviewed said that in some Asian countries, such as Japan and Singapore, airports that were previously government owned have already privatized or are transitioning to privatization. In addition, while ownership models can vary by country, they can also vary within a country. For example, according to ACI-EUROPE’s 2016 report, the United Kingdom’s airports are 53 percent fully private, 26 percent partially privatized, and 21 percent fully public. As we have previously reported, different airport ownership structures, motivations, and financing have driven airport privatization in other countries. For example, in several countries, the national government built, owned, and operated the country’s airports prior to privatization. We previously reported that national ownership enables a central government to direct the sale of its airports and can make for a more streamlined privatization transaction, reducing transaction costs for both the public- sector owner and private-sector bidders. Foreign governments may also be more motivated to privatize their airports than U.S. public-sector airport owners. According to the International Civil Aviation Organization, foreign governments’ reasons for privatizing their airports vary, including an identified need for private-sector capital investments in existing or new airports and a national move toward privatization of public assets or companies. We have previously reported that airports in other countries often have less access to public funds or tax-exempt bonds than publicly owned and operated U.S. airports, making them more reliant on private financing for airport improvements. Our prior work found that a key factor that can hinder U.S. airport privatization is the loss of some federal AIP funds and the loss of easy access to tax-exempt financing. Most of the five foreign airports we selected for our review do not receive government funding. We selected and reviewed five airports in other countries that represent each type of ownership structure previously discussed. Representatives from our five selected foreign airports all said that they rely on aeronautical revenue, which includes revenue from passenger charges and airline rates and charges as the primary source for capital development. Representatives from four of our selected foreign airports said that they rely on debt financing for infrastructure funding as well. Representatives from only one selected airport, Changi Airport in Singapore, said that they have received government funding for infrastructure projects. Table 3 below summarizes the main sources of infrastructure funding available to these selected airports. Representatives from the selected airports we interviewed said that they generate infrastructure funding from various sources of aeronautical revenue, including airline rates and charges. Some foreign airport representatives told us that revenue from airline rates and charges are not required to be used for aeronautical-related costs or infrastructure, or within the airport. Some airports, such as Helsinki Airport, may operate within a consortium network, where revenue is shared among all airports in the network to cover costs. Additionally, some airports have regulations for setting airline rates and charges. For example, the Civil Aviation Authority in the United Kingdom regulates Heathrow Airport’s airline rates and charges. Selected airport representatives we spoke with said that they consult airlines when adjusting airline rates and charges. For example, the Helsinki Airport official said that the airport updates its airline charges once a year and that airlines have an opportunity for the airlines to appeal the change. Representatives from the International Air Transport Association and the Steer Group Inc. said that some foreign airports may have higher airline rates and charges compared to some airports in the United States due to several factors, including the need to generate returns for private financing and flexibility in setting rates and charges, as outlined below. Generating returns for private financing. Foreign airports with private investment or financing may have higher rates because they need to generate returns to pay back private financing. Privately owned airports may also be under pressure to generate returns for investors and therefore need to further divert revenue from funding infrastructure. Flexibility in setting rates and charges. Foreign airports generally have greater flexibility to set airline charges to meet airport needs, a flexibility that may result in higher rates and charges. For example, Canadian airports are generally able to set and adjust airline and passenger charges as needed, and charges vary by airport. In Singapore, Changi Airport has a passenger charge and a pre-funding levy for its new terminal project. Airports in the United Kingdom, including Heathrow Airport, have a regulator that sets the airline and passenger charge cap, and adjusts it every 2 years. In addition, foreign airports have limited airline input on determining airport capital investments and fees charged to airlines. For example, according to ACI-WORLD, airports consult airlines on airport charges and on capital developments, but airport proposals can usually be implemented even if airlines do not support them, as long as a due and proper consultation process is held. An international airline stakeholder said that the extent of airline input on airport capital investment and fees charged to airlines is dependent on the country’s specific regulatory model and the willingness of the airport operator to consult with airlines, but that in some countries, airline consultation is limited. Representatives from our selected foreign airports said they generally keep airlines informed. For example, the Toronto Pearson International Airport has a consultative committee approach with airlines on larger projects costing over $50 million. If the airlines do not approve a project through the consultative committee, the project must be put on hold for one year before it can proceed. Other sources of aeronautical revenue include passenger charges. As of October 2019, for the foreign airports we reviewed, passenger charges ranged from the U.S. dollar equivalent of $9.65 to $58.58 per local traffic passenger (see table 4). Industry stakeholders and international airport association stakeholders said that U.S. airports have a unique ownership and funding model compared to foreign airports. U.S. airports have an element of public control of funding through the federal Airport Improvement Program (AIP) grants and passenger facility charges (PFC), as projects funded through these sources must receive approval from the Federal Aviation Administration. According to these stakeholders, U.S. airports are subject to different regulations related to setting passenger charges. As a result, we have determined that the comparability of these charges is limited. In addition, differences in ownership models, private investment, and funding between U.S. and foreign airports also limited the comparability of these charges. Table 4 provides an overview of passenger charges and levies at selected airports in other countries. Selected foreign airports adjust passengers’ charges based on the airport’s building and infrastructure needs and the cost imposed by passengers on the airport system. How and when these airports make adjustments varies. For example, one of our selected airports has a government entity that regulates passenger charges. More specifically, the Civil Aviation Authority in the United Kingdom regulates Heathrow Airport’s passenger charges. Every 5 years, the Civil Aviation Authority determines the maximum amount that the airport can charge based on the costs incurred by the airport. Other selected airports consider adjustments on an “as needed” basis, including the Toronto Pearson International Airport. Representatives from the Toronto Pearson International Airport said that they set and adjust passenger charges as needed to fund infrastructure investments. The airport assesses charges annually and only adjusts the passenger charges if there is a material imbalance between required cost recoveries against charges. Airport officials also stated the airport increases airline rates and passenger charges only when needed to generate sufficient revenue to cover the costs of planned infrastructure. Similar to airline rates and charges, selected foreign airport representatives told us that there generally are no restrictions on how the airports use revenue from passenger charges for infrastructure or operational costs. Industry stakeholders said that some airports, such as Heathrow Airport, do not have revenue diversion limitations, so revenue generated from passenger charges at the airport is not required to be reinvested back into the airport. Comparatively in the United States, airport revenue is regulated and generally speaking, revenue generated by the airport must go toward certain costs at the airport. Most of our selected foreign airport representatives (4 out of 5) also said that they rely on debt financing, through private bonds or commercial loans. Industry stakeholders said that airport debt financing internationally is similar to that in the United States, but foreign airports generally do not have access to the municipal bond market. Airports’ bonds are generally tax exempt in the United States. Representatives of our selected foreign airports said that they use various types of debt financing, including commercial loans from financial institutions; equity or debt financing, such as bonds in commercial capital markets; or loans from private investors. Most of our selected foreign airports (3 out of 5) do not receive government funding. International airport associations said that the extent to which an airport receives government funding may depend on whether the government owns the airport or has a role in operating the airport. For example, Changi Airport officials said that the Singaporean government is providing Changi’s government-owned, privately operated airport an unspecified amount of government funding for their new Terminal 5 project. In another example, Toronto Pearson International Airport does not receive government funding; however, in Canada, small or rural airports can receive some funding from the Canadian Airports Capital Assistance Program. Similarly, Finavia officials said that although the Helsinki Airport is publicly owned and operated, it does not receive any government funding. To provide information about how each of the five, selected foreign airports fund and finance infrastructure projects, we developed the following case studies. These airports were selected based on selection criteria of ownership models and passenger traffic. The case studies provide information on main sources of funding and financing for the airports’ infrastructure developments, factors considered when setting airline and passenger charges, coordination with airlines on capital development, and recent and planned infrastructure investments for each selected foreign airport. The majority of airports in Finland are owned and operated by the government-owned company Finavia Corporation (Finavia), a limited liability company wholly owned by the Finnish government. Specifically, Finavia operates a network of 21 Finnish airports, of which 19 offer commercial service and two are military airports. Of the remaining three airports in Finland, two are owned by local municipalities, and one is privately held. Background Helsinki Airport is owned and operated by a government-owned company, Finavia. Of Finavia’s airports, according to the Finavia representative, Helsinki Airport has the most connecting international flights and passenger boardings. For example, Helsinki Airport provides direct service to 162 international destinations, including 22 direct flights to Asia. Helsinki Airport has experienced strong passenger growth in recent years. In 2018, Helsinki Airport had 21-million passenger boardings, an increase from the prior year of about 10 percent. Most of this increase was attributable to international traffic. The Finavia representative said that Finavia anticipates passenger traffic to slow in 2020, due to an anticipated slowdown in Europe’s economic growth. Main Sources of Funding and Financing for Airport Infrastructure Investments According to the Finavia representative, Helsinki Airport’s main sources of funding for infrastructure improvements are (1) airline rates and charges, (2) passenger charges, (3) other airport-generated revenue, and (4) debt financing. Helsinki Airport collects aeronautical revenue from airline rates and charges and passenger charges directly from the airlines. Helsinki Airport does not receive any public or government funding, despite being government owned, and the airport does not have any public-private partnerships. In 2010, Finavia began operating as a limited liability company, rather than a government agency. The Finnish government corporatized Finavia to align with the European Union (EU) principles on EU services, movement of services, and competition. The Finavia representative said that the change in corporate structure helps ensure that the government is not subsidizing or promoting unfair competition practices. Airline rates and charges: Helsinki Airport generates revenue from air carrier and other aircraft operator rates and charges such as landing, aircraft parking, and electricity charges. In 2019, Finavia raised airline charges by 2.1 percent from 2018 levels, prompted by higher service costs resulting from airport investments. The Finavia representative said that airline rates and charges make up approximately 40 percent of the airport’s total aeronautical revenue. Under the airport network approach, Finavia can offset losses at one airport with revenue from a more successful airport. The Finavia representative said that some airports in the network are self- sustaining and generate sufficient revenue to cover the costs of airport operations; other network airports do not. According to the Finavia representative, Finavia applies uniform airport charges within the airport network to recover operational and infrastructure costs Passenger charges: Helsinki Airport collects a passenger charge from airlines in order to fund infrastructure used for servicing the passengers. As of January 2019, Helsinki Airport has a euro (€) 8.60 (U.S. dollar (USD) $9.65) fee per departing passenger and a across the airport network and to comply with EU directives on airport charges. €4.10 (USD $4.60) fee per transferring passenger. The Finavia representative said that passenger fees make up approximately 60 percent of the airport’s total aeronautical revenue, which include both airline and passenger fees. According to the Finavia representative, Helsinki Airport does not designate revenue from airline and passenger charges for a specific use. Revenue from airline and passenger charges has been used to cover costs from providing services and operations within the Finavia network. According to the Finavia representative, aeronautical charges, including airline rates and charges and passenger charges, are evaluated and updated once a year and Finavia sets the same charges for all airports in the Finavia airport network. Other airport-generated revenue: Helsinki Airport also generates non-aeronautical revenues from sources such as concessions, commercial services at terminals, parking services, security control, and rental income from real estate. Debt financing: Helsinki Airport uses debt financing from a variety sources, including private banks, financial institutions, and public sector sources such as the European Investment Bank, a financing institution financed by the European Union, and the Nordic Investment Bank. The financing that Helsinki Airport has obtained is similar to traditional debt financing. According to the Finavia representative, Helsinki Airport does not have any restrictions or legal requirements on the types of loans that the airport can take on, nor does Finavia pledge revenue from any specific source towards the repayment of loans. However, the Finavia representative stated that Finavia does not issue bonds. The representative said that generally, the airport has relied on traditional lending because it is easier to obtain and repay a bank loan as compared to other types of debt. Factors Considered when Setting Airline and Passenger Charges The representative said Finavia considers several factors when setting airline and passenger charges. The Finnish Act on the Airport and Network and Airport Charges requires that the pricing of airport charges within the airport network are uniform, common, and transparent, based on the service level offered, and are applied on non-discriminatory and equal grounds. Finavia therefore considers the Finavia airport network revenue; the cost of providing aeronautical services (including operational and electricity costs); and the costs of capital for infrastructure investment when setting the airport’s airline rates and charges. According to the Finavia representative, Helsinki Airport also considers the airport market to ensure that its airline and passenger fees are competitive with similar airports in other European countries. When Finavia makes changes to its airline or passenger charges, the Finavia representative said that airlines have an opportunity to appeal the change. The Finnish Transport and Communications Agency acts as an independent supervisory authority to process disagreements on airport charges. Coordination with Airlines on Capital Development As part of the capital development process, Finavia must consult with airlines to seek input on planned capital investments at the airport before the airport carries out any major new infrastructure projects. Finavia organizes these discussions to assist with negotiations, but the Finavia representative said these discussions are specific to the individual airport rather than the overall Finavia network. In addition, according to the Finavia representative, when setting airline and passenger charges, Finavia consults with airlines and provides information about how airport charges relate to the facilities and services at the airport. According to the Finavia representative, the Helsinki Airport development program, initiated in 2014 with a 2030 anticipated completion date, is the largest expansion project in the airport’s history. It will expand Helsinki Airport’s capacity and increase the number of gates. For example, the airport has planned a terminal building project that will expand the terminal by 45 percent and double the number of gates for wide-body aircraft from eight to 16 gates. In 2016, as seen in figure 10, Helsinki Airport opened one of the passenger terminal expansions, which added 12 new departure gates to the airport. On the airside, the airport will also renovate the apron area to accommodate large aircraft. Additionally, Helsinki Airport is working on a project to improve luggage and baggage handling capabilities to accommodate the anticipated increase in baggage volume expected from airlines’ use of larger aircraft. According to the Finavia representative, Helsinki Airport planned these capital improvements in response to expected passenger traffic growth. The representative anticipates that between 2025 and 2030, annual passenger boardings at Helsinki Airport will reach 30 million. A rendering of the entrance to Helsinki Airport’s completed terminal expansion is shown in figure 11, below. Finavia will use airport cash flows from passenger fees, aeronautical revenue, and non-aeronautical revenue to fund the infrastructure projects. Finavia estimates that the total cost of the Helsinki Airport infrastructure expansion will be €1 billion (USD $1.1 billion). Singapore has two airports that provide commercial service—Changi International Airport (Changi Airport) and Seletar Airport, which is a smaller airport that provides commercial and general aviation service. Background Changi Airport is the primary commercial airport in Singapore, located off the eastern coast of the country. Changi Airport was built in 1981, and according to ACI-World, was the world’s 19th busiest airport in terms of passenger boardings in 2018. While Changi Airport is government owned, the airport is operated by the Changi Airport Group—a private limited company. The Changi Airport Group is responsible for the airport’s operations and management, air hub development, commercial activities, and airport emergency services. It is also responsible for maintaining and investing in airport infrastructure and ensuring the airport is financially self-sustaining. Both airports are owned by the Singapore Ministry of Finance and operated by the Changi Airport Group. The Singapore Ministry of Finance does not have a role in the daily operations and management of the airports but reviews the types of planned airport infrastructure investments. The Changi Airport Group’s board of directors is made up of two representatives from the Singapore Ministry of Finance and other board members from the private sector. The board has discretion to design, budget, and build infrastructure projects. Changi Airport is a major hub for the region, and according to the Changi Airport Group representative, passenger boardings have been increasing steadily. For example, from 2005 to 2018, boardings increased by 30 percent. In 2018, the airport had 66.6-million boardings, an increase of about 5.5 percent from the prior year. The Changi Airport representative said that the airport is currently operating at 85 percent capacity for passenger boardings, but anticipates reaching 100 percent capacity by approximately 2026–2027. The airport has made significant investments to enhance the passenger experience at the airport. For example, the airport has enhanced terminal features for passengers, including a butterfly garden, indoor waterfalls, a four-story slide, 19 airport lounges, and luxury shopping (see fig. 12). The 2019 World Airport Awards named Changi Airport the World's Best Airport for the seventh consecutive year. From 1984 until 2009, Singapore’s airports were owned by the Singaporean government, and operated by the Civil Aviation Authority of Singapore, under the Ministry of Transport. In 2009, the airports were corporatized, and the Changi Airport Group took over airport operations and management. Through two companies, Temasek Holdings and GIC Private Limited, the Ministry of Transport owns and invests in companies that serve strategic national interests, such as infrastructure. For example, according to the Changi Airport representative, Temasek has a 50 percent stake in much of Singapore’s major infrastructure, including a 54 percent stake in Singapore Airlines, the country’s national carrier. The Civil Aviation Authority of Singapore continues to economically regulate the Changi Airport, promote the growth of the air hub and aviation industry in Singapore, oversee and promote aviation safety, and provide air navigation services. Frankfurt Airport’s Case Study Passenger traffic: 222 million Number of airports: 36 commercial airports which includes 16 international airports and 20 regional airports with scheduled passenger service. Background Frankfurt Airport began operations in 1936. According to Fraport AG’s 2018 annual report, in fiscal year 2018, Frankfurt Airport was the largest commercial service airport in Germany and the fourth largest commercial service airport in Europe. The airport is partially privatized and is owned and operated by Fraport AG. Frankfurt Airport was previously jointly owned by the federal government, the State of Hesse, and the City of Frankfurt. In June 2001, Frankfurt Airport was partially privatized, with private entities acquiring a minority ownership stake in the airport. Currently, the State of Hesse and City of Frankfurt own about 51 percent of the airport, with the remaining, about 49 percent, held by private entities. Until the 1980s, airports in Germany were traditionally owned and operated by the government. Following the 1982 creation of a federal program to privatize airports, several airports were partially privatized. According to an Airports Council International-EUROPE survey conducted in 2015, there are now two different airport ownership structures in Germany. Passenger traffic at Frankfurt Airport has increased over the last few years. According to Fraport AG’s 2018 annual report, Frankfurt Airport reached 69.5 million passengers in 2018—an increase of 5 million passenger or about 8 percent over the prior year. Partially privatized: about 47 percent of airports in Germany are partially owned by local, regional, or federal governments. Main Sources of Funding and Financing for Airport Infrastructure Investments Frankfurt Airport’s main source of funding for capital improvements are (1) airline rates and charges, (2) passenger charges, (3) other airport- generated revenue, and (4) debt financing. Airline rates and charges: Frankfurt Airport collects revenue from Fully government owned: about 53 percent of airports in Germany are owned by a public authority, or by a mixture of public authorities, at a local, regional, national, or transnational level. airline rates and charges paid by airlines servicing Frankfurt Airport. These charges include airline takeoff and landing, noise, parking, and other charges. Under German law, airports must obtain approval for certain airline rates and charges from the regional aviation authority, including airline takeoff and landing charges, noise charges, aircraft movement area charges, and parking charges. The only airport charges not subject to approval are charges for central ground-service infrastructure facilities and ground service charges. The regional aviation authority responsible for Frankfurt Airport is the Ministry of Economics, Energy, Transport and Regional Development, State of Hesse. In addition, the Airports Council International (ACI)- EUROPE’s representatives said that the majority of airports in Europe with commercial service, including Frankfurt airport, offer discount incentives to airlines in exchange for delivering higher volumes of passengers. Passenger charges: Frankfurt Airport has passenger charges that vary depending on the destination of the passenger’s flight. As with airline rates and charges, airports must also obtain approval for passenger charges from the regional aviation authority. For example, as of January 1, 2019, these charges range from euro (€)12,93 (U.S. dollar (USD) $14.51) for transfer flights to all destinations to €25,16 (USD $28.23) for international flights initiating from Frankfurt Airport. Other airport-generated revenue: Frankfurt Airport also generates revenue from airport concessions, real estate leases, parking, and other sources. Debt financing: Frankfurt Airport also relies on debt financing to fund infrastructure projects. However, we were unable to receive data from Fraport AG on how much debt financing Frankfurt airport used for capital development projects in 2018. We were not able to confirm financial information with Fraport AG about how much total revenue Frankfurt Airport generated from each of the individual sources described above. Therefore, we are not able to provide information on the total revenue generated by Frankfort Airport in 2018. However, information is available on the total revenue for all airports in the Fraport AG network. Specifically, according to Fraport AG’s 2018 annual report, the total revenue generated from approved airline rates and charges, passenger charges, and passenger services combined for the full Fraport AG group was €1,006 million (USD $1.2 million). In addition, the total revenue generated from other airport-generated revenue for the full Fraport AG group was €507 million (USD $599 million) in 2018. Fraport AG is in the process of building a new terminal—Terminal 3—at Frankfurt Airport to provide sufficient capacity and accommodate growing air traffic at Frankfurt airport. Construction for the project began in 2015 and is estimated to be completed in 2023. The first phase of the project involves construction of the main terminal building, which will include the arrival and departure levels, lounges, concession area, and a baggage handling system. This phase of the project is expected to provide capacity for about 14-million passengers a year. The second phase of the project will expand the airport facility and is expected to increase passenger capacity by up to 5-million additional passengers when completed in 2021. According to Fraport AG’s current plans, the new terminal is expected to increase capacity by up to 21 million more passengers. Fraport Ausbau Süd GmbH, a wholly owned subsidiary of Fraport AG, is responsible for managing, supervising, and monitoring the construction project. The project is being privately financed, and the estimated budget of the project is about €3.5 billion to €4 billion (USD $4.1 billion to $4.7 billion). According to Fraport AG, this project is Fraport’s largest single investment at Frankfurt Airport. We were unable to confirm information with Fraport AG representatives about factors they consider when setting airline and passenger fees or how they coordinate with airlines on the airport’s infrastructure development. Background Heathrow Airport is Europe’s busiest airport with the highest passenger boardings, and is the United Kingdom’s hub airport. Heathrow Airport has undergone transformation from a government-owned airport to a privately-owned airport. Heathrow Airport was privatized in 1987 as part of the privatization of the British Airports Authority. Currently, Heathrow Airport Holdings Limited owns and operates Heathrow Airport. In 1965, the Airports Authority Act established the British Airports Authority, an independent government agency, which assumed ownership and management of airports in the United Kingdom. Between 1966 and1987, the British Airports Authority acquired ownership and operation of seven of the 22 government airports— Heathrow, Stansted, Prestwick, Gatwick, Edinburgh, Aberdeen, and Glasgow airports. Although Heathrow is privatized, any airline and passenger charges the airport collects are subject to economic regulation by the U.K.’s Civil Aviation Authority. The Civil Aviation Authority—a government agency— regulates airport charges for U.K. airports with more than 5-million annual passengers. Airports Council International (ACI)-EUROPE representatives said that the Civil Aviation Authority regulates Heathrow on the basis that Heathrow is likely to possess significant market power for aeronautical services. In 1987, the United Kingdom privatized the British Airports Authority due to limited government funding and a need for significant capital development at large airports, according to Heathrow Airport representatives and industry stakeholders. All seven airports owned by the authority were privatized. The authority was subsequently acquired in 2006 by an international consortium led by Ferrovial Aeropuertos S.A. of Spain (Ferrovial S.A.) and named BAA Ltd. This entity was later renamed Heathrow Airport Holdings Limited. The United Kingdom became the first country to privatize its major airports. According to an Airports Council International-EUROPE survey conducted in 2015, airports in the United Kingdom have one of the following three ownership structures: Government owned: about 21 percent of airports in the United Kingdom are owned by local, regional, or national governments; experienced increased passenger numbers as a result of airlines’ use of larger aircraft that have more seats per aircraft. Main Sources of Funding and Financing for Airport Infrastructure Investments Heathrow Airport’s main sources of funding for capital improvements are (1) airline rates and charges, (2) passenger charges, (3) other airport- generated revenue, and (4) debt financing. Airline rates and charges: Heathrow Airport collects revenue from Fully privatized: about 53 percent of airports in the United Kingdom are owned by private entities. charges that it imposes on airlines that fly to and from Heathrow Airport. These charges include landing, parking, and emissions charges. Under the authority of the Civil Aviation Act of 2012, the Civil Aviation Authority establishes a pricing formula known as the “maximum revenue yield,” which sets limits on the airline and passenger charges on a per-passenger basis. In 2018, Heathrow Airport generated pounds (£) 549 million (U.S. dollar (USD) $734 million) in landing and parking charges, according to Heathrow Airport’s 2018 financial statements. Passenger charges: Heathrow Airport has several categories of passenger charges, which vary in rates depending upon the time of year of travel; whether the passenger is on a departing, transfer, or transit flight; or whether the flight destination is inside or outside of the European Union. For example, under the 2019 charges for Heathrow Airport, the passenger service charge would range from £19.84 to £46.02 (USD $25.25 to USD $58.58). In 2018, Heathrow Airport generated £1.2 billion (USD $1.6 billion) in revenue from passenger charges, according to Heathrow Airport’s 2018 financial statements. Other airport-generated revenue: Heathrow Airport also generates other revenue from retail airport concessions, parking, and other sources. Heathrow Airport generated £656 million (USD $876 million) from these sources in 2018, according to Heathrow Airport representatives. Debt financing: Heathrow airport also relies on debt financing to fund infrastructure projects. In 2018, Heathrow (SP) Limited raised approximately £2.3 billion (USD $3.1 billion) of debt financing to fund infrastructure projects. According to Heathrow Airport representatives, as of 2018, the airport has a total debt of £12 billion (USD $16 billion), which includes shareholders’ indebted equity. According to Heathrow Airport representatives, Heathrow Airport’s largest source of funding is from airline rates and charges and passenger charges, and in 2018 the airport generated £1.7 billion (USD $2.3 billion) from airline and passenger charges combined. Factors Considered when Setting Airline and Passenger Charges As previously discussed, the Civil Aviation Authority is responsible for economic regulation of Heathrow and other airports in the United Kingdom. Specifically, it regulates airline and passenger charges and determines the maximum amount in fees that Heathrow Airport can charge airlines and passengers on a 5-year basis, with adjustments every 2 years as needed. The level of airport charges that Heathrow levies each year is in accordance with the aviation authority’s pricing formula. Each year, Heathrow Airport publishes Conditions of Use that describes its airport charges. According to Heathrow Airport representatives, they have flexibility in how they categorize charges, but the charges must align with the European Union’s and United Kingdom’s non-discrimination principle standards and with the Civil Aviation Authority’s regulations. According to Heathrow Airport representatives, they consider several factors, such as the infrastructure needs at the airport and the real cost of providing services, when setting airport charges. They also set charges to influence and incentivize airline behavior. For example, to incentivize airlines to replace aircraft with newer, less polluting models, the airport charges airlines a higher fee per landing when they use older aircraft. In addition, Heathrow’s passenger fees vary depending on the passenger’s anticipated airport use and with the costs imposed on the airport system. For example, passengers on domestic flights have lower charges than passengers traveling on international flights. This differential is because domestic passengers do not use the same facilities or the same baggage facilities as an international passenger and the costs of those facilities are higher than for facilities serving domestic passengers. Coordination with Airlines on Capital Development Heathrow Airport coordinates with airlines on capital development. For example, the airport organized an Airport Consultative Committee structure to obtain input on its most recent capital development plan from the 93 airlines operating at the airport. According to representatives from the International Air Transport Association, which is an association that represents airlines, the airport used this committee to reach agreement with these airlines on a capital expenditure plan related to development at multiple terminals at the airport. Recent and Planned Infrastructure Investments at Heathrow Airport According to Heathrow Airport representatives, within the last 15 years, Heathrow Airport has completed two large capital-development projects, and the airport is currently in a planning phase. In 2008, Heathrow Airport opened Terminal 5, which had a total project cost of £4.3 billion (USD $8 billion). Subsequently, in 2014, Heathrow Airport renovated its passenger terminal—Terminal 2—which cost approximately £2.5 billion (USD $4.1 billion) to complete. Planning and design is now under way for the construction of a third lateral runway and an associated new terminal facility at Heathrow Airport, according to Heathrow Airport representatives (see fig. 13). The new runway is intended to alleviate constraints on the number of available slots for landing and takeoff. According to Heathrow Airport representatives, the new runway is expected to add capacity for at least an additional 260,000 flights per year, and the overall project will expand the airport’s surface space by 50 percent. Representatives said that according to current plans, construction of the runway and associated terminal is expected to begin in 2022 and operations are expected to start in 2027. The runway project is estimated to cost £14 billion (USD $18 billon) and will be funded through cash flows from operations, equity, and debt, according to Heathrow Airport representatives. Background The Greater Toronto Airports Authority manages and operates the Toronto Pearson International Airport (Toronto Pearson). According to Statistics Canada passenger traffic data, Toronto Pearson is Canada’s busiest airport in terms of total passenger traffic. In addition, it is North America’s second busiest airport in terms of international traffic, according to Toronto Pearson’s 2018 annual report. The Greater Toronto Airports Authority is a not-for-profit corporation without share capital, meaning it does not have any shareholders and any profits earned are invested back into the airport. Until the early 1990s, the Canadian federal government owned, operated, and maintained most airports and air navigation facilities in Canada. In 1994, the Canadian federal government issued the National Airports Policy, which created different ownership structures for NAS and non-NAS airports. The Greater Toronto Airports Authority assumed operations and management of Toronto Pearson in 1996 through a lease arrangement with the federal government. According to representatives from the airports authority, because Toronto Pearson generates the most revenues among Canadian airports, the authority pays the highest ground lease rate for Toronto Pearson among Canadian airports. For every Canadian dollar (CAD) $1 (U.S. dollar (USD) $0.75) that the airport authority earns in revenue over CAD $250 million (USD $188 million), it pays CAD $0.12 cents (USD $.09) for the ground lease. For NAS airports, the National Airports Policy devolved responsibility for the operations, management and expenditures of NAS airports from the federal government to Canadian Airport Authorities, which were set up as not-for-profit and non-share corporations. The Canadian government, however, still owns these airports. Under the law, Canadian Airport Authorities pay lease payments to the government under 60-year leases that include an option to renew for 20 years. These airport authorities are required to invest airport-generated revenues in airport operation and capital development. Passenger traffic at Toronto Pearson has increased in recent years and representatives from the Greater Toronto Airports Authority stated that according to their projections, passenger traffic is expected to continue to increase. In 2018, about 48-million passengers traveled through Toronto Pearson—an increase of 2.4 million, or 5 percent, over the prior year. According to these representatives, about 70 percent of this traffic is from origin and destination passengers and 30 percent from connecting passengers. According to the airports authority’s forecasts, passenger traffic at Toronto Pearson is expected to increase to 85 million in 2037. By contrast, for non-NAS airports, the National Airports Policy transferred ownership of these airports from the federal government to regional or local entities, such as local municipalities. The government continues to support remote and Arctic non-NAS airports that service isolated communities. Main Sources of Funding and Financing for Airport Infrastructure Investments Toronto Pearson’s main sources of funding for capital improvements are (1) airline rates and charges, (2) passenger charges, (3) other airport- generated revenues, and (4) debt financing. Toronto Pearson does not receive any government funding, although some limited government funding is available to smaller airports through Canada’s Airports Capital Assistance Program. Airline rates and charges: Toronto Pearson collects revenue from airline rates and charges, which include landing fees, terminal fees for general use of the terminal space, apron fees, deicing facility fees, and other airline charges. According to representatives from the Greater Toronto Airports Authority, airline rates and charges at Toronto Pearson have not been increased since 2012. Toronto Pearson generated about CAD $510 million (USD $393 million) in airline rates and charges in 2018 according to Toronto Pearson’s 2018 annual report. Passenger charges: Passenger charges, called Airport Improvement Fees, are fees charged at every major Canadian airport and currently range from CAD $5 to CAD $40 (USD $3.76 to USD $30.12) per passenger. Each airport authority sets its own passenger fees, and there is no cap on how much each airport can charge. According to an international industry stakeholder, airport authorities, such as the Greater Toronto Airports Authority, set their respective fees based on their analysis of what the market can bear. Toronto Pearson’s passenger fee is CAD $25 (USD $18.82) for departing passengers and CAD $4 (USD $3.01) for passengers connecting through the airport as of January 1, 2019. The airport can only use this revenue for aeronautical-related expenses, such as capital development. The Greater Toronto Airports Authority has an agreement with each air carrier that takes off from and lands at Toronto Pearson whereby air carriers agree to collect passenger fees from each of their enplaned passengers on behalf of the authority. The airports authority commits in these agreements to use passenger-fee revenues for capital programs, including associated debt service. According to representatives from the Greater Toronto Airports Authority, the airport has not increased its passenger fees since 2012, as the increased volume of passengers has generated sufficient revenue for the airport. In 2018, Toronto Pearson generated CAD $460 million (USD $355 million) from passenger fees, in the form of Airport Improvement Fees, according to Toronto Pearson’s 2018 annual report. Other airport-generated revenues: Toronto Pearson also generates revenue from other sources such as airport concessions, rental properties, car rentals, parking, and advertising. The Greater Toronto Airports Authority has more flexibility in how it can use this category of revenue, including for operating costs and for capital needs. According to the Greater Toronto Airports Authority’s 2018 annual report, the long-term objective is to increase the proportion of total revenues generated through commercial streams at the airport—from non-aeronautical sources such as parking, retail, and dining concessions—to over 40 percent. In recent years, commercial revenues have been the fastest growing component of the airport authority’s revenues. In 2018, Toronto Pearson generated about CAD $502 million (USD $387 million) in other airport-generated revenue, according to Toronto Pearson’s 2018 annual report. Debt financing: Canadian airports can generally use equity or raise debt in capital markets. In 2018, Toronto Pearson obtained CAD $500 million (USD $386 million) in bond financing. According to representatives from the Greater Toronto Airports Authority, the authority issues bonds to fund existing bond maturities and capital programs that exceed cash from operations. Revenue from passenger fees, in the form of Airport Improvement Fees, are used to service debt for infrastructure projects. Projects that cost less than CAD $400 million (USD $301 million) are funded with passenger-fee revenues, airline rates and charges, and other airport-generated revenues, according to these representatives. Factors Considered when Setting Airline and Passenger Charges Representatives from the Greater Toronto Airports Authority stated that the structure that Toronto Pearson has in place allows the airport to increase airline rates and passenger charges only when needed to generate sufficient revenue to cover the costs of planned infrastructure. According to these representatives, charges are assessed annually, but only change if there is a material imbalance between required cost recoveries against charges. To establish airline rates and charges and passenger fees, the Toronto Pearson Airport uses the “dual till” model whereby airline and passenger charges are set to recover aeronautical costs only. This contrasts with the “single till” model where all airport activities (including aeronautical and non-aeronautical) are taken into consideration when determining the level of airport charges. Representatives from the Greater Toronto Airports Authority stated that Toronto Pearson is unique among Canadian airports in doing so. Coordination with Airlines on Capital Development As part of Toronto Pearson’s passenger-fee agreements with airlines, the Greater Toronto Airports Authority must consult with airlines and obtain approval for certain capital projects in excess of CAD $50 million (USD $38 million). Approval is sought through an airline consultation committee that the airport authority established to include representatives from airlines that provide service at Toronto Pearson. If the consultative committee does not approve a project, the airport must put the project on hold for 1 year. After the 1-year hold, the project may be initiated. According to representatives from the Greater Toronto Airports Authority, if the airport has a major capital project planned, the authority keeps the airline community informed. In particular, the airport communicates regularly with the two major Canadian airlines, which make up 70 percent of the airport’s service volume, to keep them informed of planned infrastructure improvements. Recent and Planned Infrastructure Investments at Toronto Pearson Airport In 2018, the Greater Toronto Airports Authority completed several infrastructure improvements at Toronto Pearson, according to Toronto Pearson’s 2018 annual report (see fig. 14). Some of these improvements relate to ongoing projects that the airport initiated in prior years. For example, the airports authority is upgrading and expanding its capacity at Terminal 1 to accommodate narrow-body aircraft operations in response to increased passenger traffic. During 2018, the authority expended CAD $16 million (USD $12 million) for this project. In addition, the airport expended about CAD $13 million (USD $10 million) in 2018 to make improvements at Terminal 3, which is intended to enhance passenger experience and improve passenger flow. The Greater Toronto Airports Authority also expended about CAD $23 million (USD $18 million) on Phase 1 of its baggage-handling improvement project, which will add baggage-handling capacity and is intended to improve system reliability. According to representatives from the Greater Toronto Airports Authority, the authority has developed a 5-year capital plan that includes several projects intended to increase capacity and improve passenger flow at the airport. For example, the airports authority has begun the design phase for construction of a new concourse at Terminal 1 and an expansion project at that terminal. The airports authority is also in the design phase for constructing an integrated Regional Transit and Passenger Centre, and replacement of the baggage systems. The airport also plans to add more retail space and provide U.S. Customs and Border Protection space in the terminal to reduce international passengers’ connecting time by improving passenger flow. According to representatives from the Greater Toronto Airports Authority, the estimated cost of its 5-year capital plan is CAD $3.46 billion (USD $2.61 billion), which will allow the airport authority to handle 65 million passengers. This report discusses (1) levels of federal and other funding that U.S. airports received from fiscal years 2013 through 2017 for infrastructure investments, (2) projected costs of planned infrastructure investments at U.S. airports from fiscal years 2019 through 2023, and (3) any challenges selected airports face in obtaining airports’ infrastructure funding and financing. We also examined how selected airports in other countries fund and finance airport infrastructure investments. This information is presented in appendix I. To obtain information for all objectives, we reviewed relevant literature, including academic and industry literature on airport funding and financing in the United States and in other countries. We also reviewed laws, regulations, agency guidance, and prior GAO reports related to this topic. To determine what federal and other funding U.S. airports received from fiscal years 2013 through 2017 for infrastructure investments, we obtained and analyzed information on the main sources of airport funding which included: funding from federal Airport Improvement Program (AIP) grants and state grants, revenue from passenger facility charges (PFC), airport-generated revenue, capital contributions, and amounts of financing airports received from bond proceeds and other debt financing. Because comprehensive data on airport capital spending is not available, we framed our research objective to examine funding received rather than how much airports expended on infrastructure projects. We selected fiscal years 2013 through 2017 because it was the most recent 5-year period where complete data were available. For each funding source, we determined average annual-funding amounts for fiscal years 2013 through 2017 for all U.S. national system airports, as well as separately for larger airports and smaller airports. We defined larger airports to include large and medium hubs, and smaller airports to include small hubs, non-hubs, non-primary commercial service, reliever, and general aviation airports. We also analyzed how the amounts of funding received have changed from fiscal years 2013 through 2017. We presented all funding amounts in 2017 dollars. We obtained funding data from various sources, as follows: AIP funding: To determine how much funding airports received from federal AIP grants, we obtained and analyzed data from the Federal Aviation Administration’s (FAA) System of Airports Reporting (SOAR) database on AIP grants awarded by FAA during our study period. This database includes detailed information about AIP grants and PFC applications, approvals, and collections. We analyzed the AIP grant data to determine total annual funding by airport type for fiscal years 2013 through 2017, as well as average annual funding by airport type and project type over the same time period. State grants: Data on state funding for fiscal years 2013 through 2017 are available but are not complete, and we were not able to obtain additional information to verify the data’s reliability. As part of our 2015 review of airports’ infrastructure funding, we conducted a survey in 2014 with the assistance of the National Association of State Aviation Officials (NASAO), to determine how much funding airports received from state grants for fiscal years 2009 through 2013. Results from this survey were reported in our 2015 report and in NASAO’s August 2015 report, NASAO State Aviation Funding and Organizational Data Report. For this review, we interviewed NASAO officials and they confirmed that the level of state funding has largely remained unchanged since the 2015 study. Therefore, we incorporated information from the 2015 survey into our current report. PFCs: To determine how much funding airports received from PFCs, we obtained and analyzed data from the SOAR database on PFC collection amounts at all airports that collected PFCs during fiscal years 2013 through 2017. Because we were unable to obtain data on airports’ expenditures of PFC revenues by project type from fiscal years 2013 through 2017, we instead obtained data on airports’ FAA- approved applications from 1992 through February 2019 showing the types of projects on which airports intended to spend their PFC revenue. Airport-generated revenue: For airport-generated revenue, which we defined as revenue available for capital development, we obtained and analyzed airport financial data from FAA’s Certification Activity Tracking System (CATS). Examples of airport-generated revenue include aeronautical revenue (including revenue earned from leases with airlines and landing fees) and non-aeronautical revenue (such as earnings from airport terminal concessions and vehicle parking fees). We analyzed the financial data to determine the amount of airport- generated revenue that airports had available for infrastructure investments, as well as amounts by airport type, for each fiscal year 2013 through 2017. We calculated airport-generated revenue by using data for the total operating revenue of an airport, subtracted by the subtotal of operating expenses, prior to subtracting depreciation, which yields operating income plus interest income. For data precision, we used a different methodology to calculate airport- generated revenue than that of our 2015 report on airport finance by not subtracting an estimated amount of PFCs used to pay for interest expense. As a result, airport-generated revenue reported here is not comparable to airport-generated revenue in our 2015 report. Airport capital contributions: To determine how much funding airports received from capital contributions, we analyzed the same set of airport financial data from CATS that we used for airport-generated revenue, discussed above. We used the line item for capital contributions (8.5 Capital Contributions) in CATS for our analysis. Airport bonds: In addition to the sources of airport funding listed above, this report also separately discusses information on airport bonding—a common financing mechanism for some airports. We analyzed FAA financial data from the CATS database on the amounts of financing that airports received from bond proceeds (line item 14.1). We also interviewed representatives at two ratings agencies—Fitch Ratings and Moody’s Investors Service—and a representative from Piper Sandler (formerly Piper Jaffray) to obtain their perspectives on the availability of airport bond financing. We assessed the reliability of FAA’s CATS data on airport financial information and SOAR data by reviewing documentation about the data and the systems that produced these data. We also interviewed FAA officials knowledgeable about the collection, maintenance, and security of these data. We also reviewed documentation that also relied on the FAA’s CATS and SOAR data and that was collected for our prior review of airport infrastructure funding and financing for a similar purpose. We determined that these data were sufficiently reliable to report funding and financing that airports received from AIP, PFCs, airport-generated revenue, capital contributions, and bond revenue for fiscal years 2013 through 2017. To determine the projected cost of airports’ planned capital development from fiscal years 2019 through 2023, we combined (1) FAA’s most recent estimate for AIP-eligible development from its Report to Congress National Plan of Integrated Airport Systems (NPIAS) 2019-2023, released in September 2018, and (2) Airports Council International – North America’s (ACI-NA) most recent estimate for AIP-ineligible development for the same time period, as reported in its February 2019 report, Terminally Challenged: Addressing the Infrastructure Funding Shortfall of America’s Airports. We developed estimates of infrastructure development costs for all national system airports, as well as by airport type. We also presented estimates of AIP-eligible development costs by project type; these estimates were based on estimates in the NPIAS report. We did not, however, present estimates of AIP-ineligible data by project type because ACI-NA’s data do not readily support such a presentation. We presented all dollar amounts in 2017 dollars. To identify changes in airports’ project costs of planned infrastructure investments, we also reviewed FAA’s NPIAS report for fiscal years 2017– 2021 and ACI-NA’s report on airports’ capital development needs for fiscal years 2017–2021, and we compared the estimates in those reports to the fiscal years 2019–2023 estimates. ACI-NA’s estimates of U.S. airports’ infrastructure project costs differ from those of FAA’s due to scope, methodology, and other reasons. For example, the ACI-NA cost estimate includes estimates for AIP-eligible and AIP-ineligible projects, while FAA only includes AIP-eligible projects as required by statute. ACI-NA’s estimate also includes projects that have already identified funding sources as well as those that have not. By comparison, FAA only includes projects without identified funding. The methodology that FAA and ACI-NA use to develop their estimates also differs. For example, FAA developed its estimates for the fiscal year 2019 through 2023 time period by reviewing information from airport plans that were available through 2017. According to ACI-NA’s report on airports’ capital development needs for 2019–2023, its cost estimates for fiscal years 2019–2023 are based on a survey of 86 airports completed in 2018. This number represents the airports with 90 percent of all enplanements in 2017. ACI-NA survey respondents were asked to report all infrastructure costs, including interest, construction and management costs, architectural and engineering costs, and contingency costs. FAA’s estimate does not include interest and contingency costs. We reviewed FAA documentation describing the methodology for producing the NPIAS cost estimate from airport-planning documents, and interviewed FAA officials. We determined FAA’s estimate of AIP-eligible planned infrastructure costs to be reliable for the purposes of our report. Similarly, we reviewed ACI-NA’s methodology for developing its report on airports’ capital development needs for 2019–2023 and interviewed ACI-NA representatives about their methodology for developing this estimate. We determined that ACI-NA’s response rates, shares of enplanements represented by the airports that responded, and ACI-NA’s estimation methodology were sufficiently reliable for the purposes of presenting an estimate of planned infrastructure costs for AIP-ineligible projects. To obtain information about any challenges airports face in obtaining airport funding and financing, we reviewed documents from and conducted interviews with representatives from ACI-NA and airport officials from 19 selected U.S. airports. We also interviewed representatives from the American Association of Airport Executives. Through our document review and interviews, we obtained information about the sources of funding and financing that airports currently receive, planned infrastructure projects, and challenges to obtaining funding and financing for these projects. We selected airports representing different hub sizes, airports with the highest planned development costs as reported in FAA’s NPIAS fiscal years 2019–2023 report, airports with increasing and decreasing enplanements in calendar years 2013 through 2017, airports that were mentioned in our literature review and that were recommended by FAA and other stakeholders whom we interviewed, and we considered the geographic location of the airport. We also visited three locations from our selected airports to discuss and view examples of airports’ planned infrastructure projects. The airports we visited included Seattle-Tacoma International Airport, Spokane International Airport, and Paine Field Airport. See table 4 for a list of all the airports where we conducted interviews. We also interviewed representatives from Airlines for America (A4A)—the U.S. airline association—and representatives from eight selected U.S. airlines to obtain their views on airport infrastructure funding and financing issues. We selected airlines with the highest passenger traffic, as measured by revenue passenger miles. In addition, we selected airlines representing legacy and low cost carriers, and airlines that provide service outside the United States. Selected airlines that we interviewed were: Alaska Airlines, American Airlines, Delta Air Lines, Frontier Airlines, JetBlue Airways, Southwest Airlines, Spirit Airlines, and United Airlines. Collectively, the selected airlines transported about 90 percent of total U.S. passenger traffic in 2018. Because we used a nonprobability sample of airport and airlines to interview, our interviews are not generalizable. Last, to obtain information about how foreign airports fund and finance infrastructure development, we reviewed documents from and conducted interviews with international airport associations, international aviation- industry stakeholders, and representatives from four of the five foreign airports that we selected as case studies. These airports included: Toronto Pearson International Airport (Canada); Frankfurt Airport (Germany); Heathrow Airport (United Kingdom); Helsinki Airport (Finland); and Changi Airport (Singapore). Representatives from Frankfurt Airport provided us with written responses and documents for our review. See table 5 for a list of international organizations and foreign airports where we conducted interviews. For each of the five selected foreign airports, we collected information about airport infrastructure funding at the airports, including the sources of funding and financing the airports use, types of projects the airport has planned, and factors they consider when setting airport charges, among other topics. In addition, for each of our case studies, we presented financial information in the appropriate foreign currency as well as in U.S. Dollars (USD) in parentheses. We converted foreign currency information to U.S. Dollars using Federal Reserve data on foreign exchange rates. For 2018 data, we used the Federal Reserve 2018 annual rate. For 2019 data, we calculated a Federal Reserve 2019 annual rate. The primary criterion that we used to select foreign airports as case studies was the ownership model of the airport. To ensure our selection included a mix of ownership models, we selected airports that fit each of the following ownership models: Government owned and operated Government owned and privately operated Partially privatized Not-for-profit, private corporation As secondary criteria, we selected foreign airports with the highest passenger traffic among international airports, airports which had service by U.S. carriers, and airports located in regions where it would be feasible to obtain information and interview officials. Because we used a nonprobability sample of foreign airports to interview, our interviews are not generalizable. While our case studies of foreign airports and their experiences with funding and financing airport infrastructure are not generalizable to all foreign airports, they provide a range of examples of how foreign airports fund and finance airport infrastructure. We conducted this performance audit from September 2018 to February 2020 in accordance with generally accepted government auditing standards. Those standards require that we plan and perform the audit to obtain sufficient, appropriate evidence to provide a reasonable basis for our findings and conclusions based on our audit objectives. We believe that the evidence obtained provides a reasonable basis for our findings and conclusions based on our audit objectives. In addition to the contact named above, Jean Cook and Susan Zimmerman (Assistant Directors); Maria Mercado (Analyst-in-Charge); Pin-En Annie Chou; Jessica Du; Sharon Dyer; David Hooper; Delwen Jones; Grant Mallie; Josh Ormond; Pam Snedden; Kelly Rubin; and Rebecca Rygg made key contributions to this report.
U.S. airports are important contributors to the U.S. economy, providing mobility for people and goods, both domestically and internationally. About 3,300 airports in the United States are part of the national airport system and eligible to receive federal AIP grants to fund infrastructure projects. To help fund these projects, certain categories of airports are also authorized by federal law to collect PFCs, which passengers pay when buying tickets. GAO was asked to examine airport- funding sources and planned infrastructure projects. This report examines, among other issues: (1) levels of federal and other funding that U.S. airports received from fiscal years 2013 through 2017 for infrastructure projects, (2) projected costs of planned infrastructure investments at U.S. airports from fiscal years 2019 through 2023, and (3) any challenges selected airports identified in obtaining projects' funding and financing. GAO analyzed airport-funding data for AIP grants, PFCs, airport-generated revenue, and other sources for fiscal years 2013–2017—the most recent years for which data were available—and FAA's and Airports Council – North America's cost estimates of airports' planned infrastructure projects for fiscal years 2019–2023. GAO also interviewed FAA officials; representatives from airline and airport associations, and bond-rating agencies; officials from 19 selected airports representing airports of different sizes and with the highest planned development costs, among other things; and representatives from eight selected airlines, selected based on factors such as passenger traffic. From fiscal years 2013 through 2017, U.S. airports received an average of over $14 billion annually for infrastructure projects. The three largest funding sources are below: Funding from federal Airport Improvement Program (AIP) grants has remained relatively constant, at an annual average of $3.2 billion. Smaller airports (small hub, non-hub, and general aviation) collectively received more AIP funding compared to larger airports (large and medium hub). Revenue from federally authorized passenger-facility charges (PFC), a per-passenger fee charged at the ticket's point of purchase, increased by 9 percent, with an annual average of $3.1 billion. Increases in passengers and PFC revenue at larger airports contributed to this increase. Airport-generated revenue (e.g., concessions and airline landing fees) increased by 18 percent, with an annual average of $7.7 billion. While both larger and smaller airports experienced increases in these revenues, the larger airports made up 92 percent ($7.1 billion) of these revenues. In addition to these sources, some airports obtained financing by issuing bonds, secured by airport revenue or PFCs. According to Federal Aviation Administration (FAA) data, larger airports were able to generate more bond proceeds than smaller airports in part because larger airports are more likely to have a greater, more certain revenue stream to repay debt. Airports' planned infrastructure costs for fiscal years 2019 through 2023 are estimated to average $22 billion annually (in 2017 dollars)—a 19 percent increase over prior estimates for fiscal years 2017 through 2021. These costs are expected to increase in part because airports are planning to invest in more terminal projects. For example, cost estimates for AIP-eligible terminal projects increased about 51 percent when compared to FAA's prior 5-year estimate. FAA and airport association representatives stated that terminal projects can be more expensive than other projects because of the scale of the improvements, which can include renovating terminals to repair aging facilities and accommodate larger aircraft and growth in passengers. Officials from GAO's 19 selected airports cited several challenges to funding infrastructure projects. For example, officials stated that the funding and revenue they receive from combined sources may not be sufficient to cover the costs of planned infrastructure projects. The officials also raised concerns about being able to finance future airport-infrastructure projects because they have already obligated their current and future PFCs to service debt on completed and ongoing infrastructure projects. According to FAA data, in fiscal years 2013 through 2017, airports paid a total of $12 billion—or 78 percent of total PFC revenues collected—for debt service. Bond-rating agencies, however, continue to give airports high or stable ratings, and rating agencies' representatives stated that airports' access to capital markets continues to remain favorable. Some airport officials stated that to address funding challenges, they have deferred some needed infrastructure investments or completed projects in phases, steps that increased construction times and costs.