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.

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.

 Stock photo ID: 106069700

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Editorial credit: Benjamin Doyle / Shutterstock, Inc.

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