Air Force One USA presidential modified Boeing aircraft free tour USAF museum in Dayton Ohio

Air Force One is the official air traffic control-designated call sign for a United States Air Force aircraft carrying the president of the United States. The term is commonly used to denote U.S. Air Force aircraft modified and used to transport the president, and as a metonym for the primary presidential aircraft, VC-25, although it can be used to refer to any Air Force aircraft the president travels on.

SAM 26000 is the first of two Boeing VC-137C aircraft specifically configured and maintained for use by the President of the United States. It used the callsign Air Force One when the president was on board, otherwise SAM 26000 (spoken as 'SAM two-six-thousand'), with SAM indicating Special Air Mission.

A Boeing VC-137C with Air Force serial number 62-6000, SAM 26000 was a customized Boeing 707. It entered service in 1962 during the administration of John F. Kennedy and was replaced in presidential service in 1972 but kept as a backup. The aircraft was finally retired in 1998 and is now on display at the National Museum of the United States Air Force near Dayton, Ohio.