The Space Shuttle Discovery, aboard a sp
The Space Shuttle Discovery, aboard a specially modified NASA Boeing 747, flies over the Washington, DC, April 17, 2012, as seen from Arlington, Virginia. NASA is transferring the Shuttle, which completed 39 missions and spent 365 days in space, to the Smithsonian National Air and Space Museum Steven F. Udvar-Hazy Center at Dulles Airport. AFP PHOTO / Saul LOEB (Photo credit should read SAUL LOEB/AFP/Getty Images)