Guard's F-16 Fighting Falcon still operates at the base. The 115th Fighter Wing is one of the 14 operational air defense units responsible for air defense of the eastern continental United States. On December 15, 1966, a 31,000 square foot terminal building opened on the west side of the airfield at a cost of $2.36 million. The first scheduled jets were Northwest Orient 727s in 1965. In 1986, the airport tripled in size with a $12 million project that expanded the terminal from 32,000 square feet to 90,000 square feet, adding a second-level concourse with six boarding bridges. In 2006, the airport completed a $68 million expansion that doubled the size of the terminal, built in a Frank Lloyd Wright-influenced prairie style designed by the Architectural Alliance based in Minneapolis. The new terminal accommodates 13 gates with jetways, WiFi, additional restaurant and retail vendors post-security, an art court, and both business and family lounges. The airport has also continued to expand its parking options, most recently in 2014. On February 7, 2018, the airport announced a significant terminal modernization program, including replacement of existing jet bridges and design work beginning in 2018 as well as major construction including additional jet boarding bridges beginning in 2019. The county is also planning to add an 8 MW solar energy site on airport-owned land. In 2021, the airport began construction on an $85 million expansion of the terminal dubbed the South Terminal expansion. This project will add three additional gates that can accommodate larger aircraft. The new terminal will be two stories with 45,000 square feet of public space. The first floor will consist of 45,000 square feet of maintenance workshops and infrastructure. The concourse floor above will include the new gates, a restaurant, a play area for children, a nursing suite for mothers and a service animal relief area. Facilities Runways Dane County Regional Airport covers 3,500 acres (1,416 ha) with a field elevation of 887 feet (270 m) above mean sea level. It has three concrete runways: 18/36 is 9,006 by 150 feet (2,745 x 46 m); 3/21 is 7,200 by 150 feet (2,195 x 46 m); 14/32 is 5,846 by 150 feet (1,782 x 46 m). The fixed-base operator (FBO) is Wisconsin Aviation, which leased the assets of the former FBO, Four Lakes Aviation and Coldstream Aviation, in 1994. In February 2023, there were 143 aircraft based at this airport: