Discovery flies by the Capitol, posted to Twitter via Instagram. (CWG reader Adam Wells)

Discovery flies over the Potomac towards National Airport. (Washington Post reader Jim Scanlon)

See below for photos of the flyover...

Space shuttle Discovery mounted atop NASA 905 sails over the Capitol in Washington, D.C. (CWG reader Hannah Hamill)

Discovery flies over the Washington Monument (Craig Cook of Studio Twenty Seven Architecture)

Discovery flies over the Pentagon (CWG reader Eric Stringfellow )

Allow a few seconds for compilation of reader photos to load and see these blogs: CWG reader Joel Housman and David Smith

The space shuttle Discovery atop NASA 905 aircraft takes off from Kennedy Space Center in Florida at about 7 a.m. EDT Tuesday morning. (NASA)