Space shuttle Discovery flies into retirement —
Space shuttle Discovery, mounted atop a 747 shuttle carrier aircraft, goes by the Washington Monument during a flyover of the nation's capital on its trip to retirement Tuesday, April 17. The flight -- the last time Discovery will be aloft -- took it from Florida's Kennedy Space Center to the Washington area, where it will spend retirement as a museum piece at an annex to the Smithsonian National Air & Space Museum in Chantilly, Virginia, near Dulles International Airport.