WASHINGTON, D.C.- APRIL 17: Space Shuttle Discovery on top of a Boeing 747, escorted by a Northrop T-38 chase plane, en route to Dulles Airport in Washington D.C. on April 17, 2012.
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WASHINGTON, D.C.- APRIL 17: Space Shuttle Discovery on top of a Boeing 747, escorted by a Northrop T-38 chase plane, en route to Dulles Airport in Washington D.C. on April 17, 2012.