The space shuttle Endeavour, riding piggyback on a modified jumbo jet, flies north of"A" Mountain on its way to the California Science Center in Los Angeles. The low flyover Thursday was a tribute to former U.S. Rep. Gabrielle Giffords and her husband, ex-astronaut Mark Kelly.
America's space shuttle Enterprise rides atop the 747 carrier as she takes off from Edwards Air Force Base, Calif., Aug. 12, 1977. The shuttle is to be blasted away from the 747 for her first free flight. (AP Photo)