Space shuttle Endeavour makes its departure atop a modified jumbo jet from the Kennedy Space Center, Wednesday, Sept. 19, 2012, in Cape Canaveral, Fla. Endeavour will make a stop in Houston before heading to the California Science Center in Los Angeles. (AP Photo/John Raoux)

Photo by: John Raoux

Space shuttle Endeavour makes its departure atop a modified jumbo jet from the Kennedy Space Center, Wednesday, Sept. 19, 2012, in Cape Canaveral, Fla. Endeavour will make a stop in Houston before heading to the California Science Center in Los Angeles. (AP Photo/John Raoux)