United Space Alliance technicians watch as space shuttle Endeavour is lowered at NASA's Kennedy Space Center in Florida.

United Space Alliance technicians watch as space shuttle Endeavour is lowered onto the Shuttle Carrier Aircraft, or SCA, at the Shuttle Landing Facility at NASA's Kennedy Space Center in Florida. The SCA, a modified 747 jetliner, will fly Endeavour to Los Angeles where it will be placed on public display. Photo credit: NASA/ Dmitri Gerondidakis