Scott Rush photographs space shuttle Endeavour as it atop the shuttle aircraft carrier after landing Wednesday, Sept. 19, 2012, at Ellington Field in Houston. Endeavour is making a final trek across the country to the California Science Center in Los Angeles, where it will be permanently displayed. (AP Photo/David J. Phillip

Photo by: David J. Phillip

Scott Rush photographs space shuttle Endeavour as it atop the shuttle aircraft carrier after landing Wednesday, Sept. 19, 2012, at Ellington Field in Houston. Endeavour is making a final trek across the country to the California Science Center in Los Angeles, where it will be permanently displayed. (AP Photo/David J. Phillip