At present it usually refers to one of two specially configured Boeing 747-200s, although there are other smaller aircraft in the presidential fleet.
Any aircraft used to carry the president is referred to as Air Force One.
At present it usually refers to one of two specially configured Boeing 747-200s, although there are other smaller aircraft in the presidential fleet.
The two 747s are equipped with state-of-the-art communications systems, a stateroom and executive conference rooms, accommodation for the press and private quarters for the president and the first family.
Both aircraft are designed to operate as independently as possible from ground support should the need arise.
They are fitted with self-contained baggage loading equipment, front and rear stairs, a medical centre and the capability for in-flight refuelling.
The US Vice President's aircraft, used by Al Gore for election campaign visits, is known as Air Force Two.