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The 747-400 is the latest model of the 747s and is the only model in production. It added winglets[?], new flight decks and in-flight entertainment to the 300 series. The 747-400ER is 400's extended range version. The 747-400 added the immediately noticeable 'hump' to the upper deck, which is considered the 747's most distinguishable feature.
The current U.S. Presidential aircraft, VC-25A, is among the most famous 747 models. It is popularly known as Air Force One, even though that name refers to any United States Air Force aircraft carrying the President. VC-25A is based on the civilian Boeing 747-2G4B. Other special 747s include four 747-200s which were converted for the U.S. Air Force to airborne emergency command and control posts, a 747 to transport the Space Shuttle and aerial refueling tankers.
See also: Space Shuttle
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