of the terrorist attacks on September 11, 2001, the Federal Aviation Administration changed the rules for the landing and departure of general aviation aircraft at LaGuardia. Pilots operating a non-scheduled IFR flight are now required to make a reservation via the FAA's e-CVRS system no more than 72 hours prior to the flight's arrival or departure while public charter flights may make a reservation up to six months prior. Unscheduled IFR flights may only operate at LaGuardia with a reservation from the hours of 6:00 am to 9:59 pm local time Monday thru Friday and 12:00 pm to 9:59 pm local time on Sundays. Reservations for unscheduled IFR flights are not required all day on Saturdays. Aircraft without a reservation will be redirected to either Teterboro Airport or Linden Airport. A private seaplane base, EDO , operates three waterways in Flushing Bay and the East River north of LaGuardia Airport. Ground transportation , buses are the only mode of mass transit to connect the airport with its surroundings. All terminals are served by accessible public MTA bus lines—including two Select Bus Services (SBS)—and free transfers to the New York City Subway are provided via OMNY or MetroCard payments. M60 Select Bus Service (All terminals) Q47 (Terminal A (Marine Air Terminal) only) Q48 (all terminals) Q70 "LaGuardia Link" Select Bus Service (all terminals except Terminal A) Q72 (all terminals except Terminal A) The airport also features a complementary internal shuttle bus route which makes stops at all terminals. Despite many failed proposals throughout its history, LaGuardia is not served directly by rail. Nearby lines of the New York City Subway and Long Island Rail Road (LIRR), however, provides northern Queens with connections to the greater New York metropolitan area and are commonly accessed from the airport by public bus or private car services. The airport is mainly accessible via the Grand Central Parkway and overpasses at 94th street and 102nd street. Taxicabs serving LaGuardia are metered and licensed by the New York City Taxi and Limousine Commission, and uniformed airport employees are stationed to dispatch fares. For-hire-vehicles (FHV) including limousines and rideshare operators are accommodated at designated locations. In 2019, PANYNJ approved the implementation of "airport access fee" surcharges on FHV and taxi trips, with the revenue earmarked to support the agency's capital programs. Other facilities When New York Air was in operation, its headquarters were in Hangar 5 at LaGuardia.