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When is the vice president’s aircraft called Air Force Two?
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Air Force One
Air Force One, a Boeing 747 reserved for use by the president of the United States, flying over Mount Rushmore, South Dakota.
The term "Air Force Two" is the radio call sign used by any U.S. Air Force aircraft while the vice president of the United States is on board.12
Similar to how "Air Force One" is the call sign for any Air Force plane carrying the president, the designation for the vice president’s aircraft is determined strictly by their presence on the flight.12