March 15, 1952. The latter would grow to be a major international race. In 1959, the racetrack hosted the first Formula One United States Grand Prix. For much of Sebring's history, the track followed a 5.38 mile (8.66 km) layout. In 1983, the track was changed to allow simultaneous use of the track and one of the runways. In 1987, more changes allowed use of another runway. Further changes in 1991 accommodated expansion of the airport's facilities, and brought the track close to its current configuration. The entire track could now be used without interfering with normal airport operations. See also List of airports in Florida Sebring International Raceway References Other sources Manning, Thomas A. (2005), History of Air Education and Training Command, 1942–2002. Office of History and Research, Headquarters, AETC, Randolph AFB, Texas Shaw, Frederick J. (2004), Locating Air Force Base Sites, History’s Legacy, Air Force History and Museums Program, United States Air Force, Washington DC. External links Sebring Regional Airport, official site US Sport Aviation Expo Volo Aviation, Fixed-Base Operator/Manager Aerial image as of January 1999 from USGS The National Map Airports established in 1941 Airports in Florida Buildings and structures in Sebring, Florida Transportation buildings and structures in Highlands County, Florida Special economic zones of the United States 1941 establishments in Florida