Final flyover for space shuttle Discovery

The space shuttle Discovery, carried on the back of a jumbo jet, flies over Washington on Tuesday en route to the Smithsonian National Air and Space Museum.

A man waves as he joins others standing atop a platform on one of the towers at the Washington National Cathedral, watching as the NASA Space Shuttle Discovery, being carried piggyback on a modified Boeing 747, makes it's way in the skies above Washington, D.C., Tuesday, April 17, 2012, as it makes it's way to the Steven F. Udvar-Hazy Center in Chantilly, Va. (Rod Lamkey Jr/The Washington Times)

A man waves as he joins others standing atop a platform on one of the towers at the Washington National Cathedral, watching as the NASA Space Shuttle Discovery, being carried piggyback on a modified Boeing 747, makes it's way in the skies above Washington, D.C., Tuesday, April 17, 2012, as it makes it's way to the Steven F. Udvar-Hazy Center in Chantilly, Va. (Rod Lamkey Jr/The Washington Times)

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