File Description: FS 2004 Aircraft - The Lockheed Jetstar was the first business jet. A four-engined aircraft, with several engine models installed, the aircraft was in production from 1957 to 1979. It entered service in early 1961. The first two Jetstars were twin engined airplanes, powered by Bristol Siddeley Orpheus turbojet engines. The second was refitted with the four Pratt & Whitney JT12 engines that were installed on all the first Jetstars. Garrett TFE731 turbofans were installed on later airplanes. A total of 204 Jetstars were built by Lockheed in several models. Military versions flew four U.S. Presidents, carrying the Air Force One designation while they were aboard (some jokingly called it Air Force One Half.) This model represents the first two Jetstars. By John B. Loney, Jr.