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SEATTLE -- The Boeing VC-25 is the official military designation of the jet that carries the President. We know it as a 747 - Air Force One when the President is on board.

Two VC-25s were delivered in 1990, 24 years ago. But this fall, Boeing and other airplane makers like Airbus can expect a request for proposals for a new presidential jet.

Boeing could offer the 747-8, a much larger version of the plane, complete with its four engines and capable of staying aloft around the clock, with mid-air refueling capabilities like the current fleet.

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