Boeing VC-25 Many of the VC-25's other capabilities are classified for security reasons. After a presidential inauguration resulting in a change in office, the outgoing president is provided transport on a VC-25 aircraft to their home destination. The aircraft for this flight does not use the Air Force One call sign because it is not carrying the president in office. For both Presidents Bill Clinton and George W. Bush, the flight was known as "Special Air Mission 28000", where the number represents the aircraft's tail number. The VC-25A has also been used to transport deceased former presidents. The guest area aft of
Boeing VC-25 in general. The two aircraft often operate in conjunction with "Marine One" helicopters, which ferry the President to airports whenever a vehicle motorcade would be inappropriate. Two new aircraft, designated as VC-25B, are scheduled to be delivered by 2024. By 1985, the pair of Boeing 707-based VC-137s used as the Presidential aircraft had been in service for 23 and 13 years respectively, and the USAF began searching for an eventual replacement. The Request for Proposal issued stated that the aircraft to be selected should have at least three engines and an unrefueled range of at least . Both Boeing with