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Air Force One is the call sign for any USAF aircraft carrying the President of the United States (POTUS). The first aircraft dedicated to presidential airlift was a specially outfitted C-54 Skymaster nicknamed Sacred Cow served Franklin D. Roosevelt and Harry S. Truman. The name 'Air Force One' was first used in 1953 after an incident in which Dwight D. Eisenhower's aircraft shared a call sign with a commercial flight. A number of different airframes have been used for presidential transport, including a C-118 Liftmaster, C-121 Constellation, and a C-137 Stratoliner. Currently Air Force One is most commonly a modified Boeing 747-200B designated as VC-25 by the Air Force.