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In this early Sunday morning, May 19, 1996 picture, the space shuttle Endeavour lifts off from Kennedy Space Center in Cape Canaveral, Fla. Friday, April 29, 2011 is scheduled to be the 25th and final flight of Endeavour, NASA's youngest shuttle that was built to replace the Challenger and first soared in 1992, six years after the launch accident. And it will be the second-to-last shuttle mission, as NASA winds down the 30-year shuttle program with the last launch of Atlantis in early summer 2011. (AP Photo/Chris O'Meara)