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Last Flight of Discovery April 17, 2012: The Space shuttle Discovery, mounted atop a NASA 747 Shuttle Carrier Aircraft, flying over Washington skyline, including the Washington Monument, as seen from a NASA T-38 aircraft. Discovery, the longest-serving orbiter will be placed to its new home, the Smithsonian's National Air and Space Museum's Steven F. Udvar-Hazy Center in Chantilly, Va. Source: AP Photo/NASA, Robert Markowitz