Five Air Force One facts you didn't know. First, Air Force One is multiple planes. The callsign "Air Force One" is used for any fixed-wing aircraft carrying the US President. Second, it can withstand a nuke. If you can get in, Air Force One is ideal for nuclear emergencies. The aircraft's structure is meant to withstand a ground-based nuclear weapon, making it an aerial bomb shelter. The third fact is that it became a spy plane in 1959. Due to the Cold War's risk to US national security, CIA director Allen Dulles transformed Air Force One into a spy plane. In 1959, sophisticated cameras were hidden in aircraft wheel wells and could read license plates from 29,000 feet. Fact #4: Air Force One nearly collided with a commercial airliner. Air Force 8610 was Eisenhower's 1953 call sign. The control tower mistook it for Eastern Airlines flight 8.610 when the two planes entered each other's territory. That near-miss led to the permanent use of "Air Force One".