WASHINGTON, D.C. - APR 17: U.S. Space shuttle Discovery, mounted on the Shuttle Carrier Aircraft, has flown over the Washington Monument, Capitol and Lincoln Memorial in Washington, D.C. area on April 17, 2012 in Washington, DC
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WASHINGTON, D.C. - APR 17: U.S. Space shuttle Discovery, mounted on the Shuttle Carrier Aircraft, has flown over the Washington Monument, Capitol and Lincoln Memorial in Washington, D.C. area on April 17, 2012 in Washington, DC