The Space Shuttle Discovery, mounted atop a modified 747 jet, flew over the National Mall in Washington, D.C. on April 17, 2012 on its way to its permanent home at the Smithsonian's National Air and Space Museum Steven F. Udvar-Hazy Center in Chantilly, Va. NASA's donation of the shuttle was recognized and celebrated during a special ceremony that followed its flight, landing, demating and towing.