Air Force One is not a single plane but is simply the name for whatever plane the president happens to be on.
Air Force One is the designation of any airplane that serves the President of the United States government. The same planes are used by the vice-president but are called Air Force Two when he is aboard. The presidential fleet consists of two customized Boeing 747-200B aircraft (military designation VC-25A) called SAM 28000 and 29000.
The name Air Force One was established after an incident in 1953, when Eastern Airlines flight 8610 crossed paths with the president's plane, then called Air Force 8610, although the Air Force One name was not made official until 1962.
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