Maintenance technicians check NASA's Shuttle Carrier Aircraft modified 747 jet or SCA after arriving from Edwards Air Force Base.

At the Shuttle Landing Facility at NASA’s Kennedy Space Center in Florida, maintenance technicians from NASA’s Dryden Flight Research Center in California and Kennedy check NASA’s Shuttle Carrier Aircraft modified 747 jet, or SCA, after arriving from Edwards Air Force Base in California.

During the Space Shuttle Program’s transition and retirement processing, Discovery was prepared for display at Smithsonian’s National Air and Space Museum, Steven F. Udvar-Hazy Center in Chantilly, Va. Discovery is scheduled to be transported atop the SCA, designated NASA 905, to Dulles International Airport in Virginia on April 17 and then moved to the Smithsonian for permanent public display on April 19. The SCA is assigned to the remaining ferry missions, delivering the shuttles to their permanent public display sites. For more information, visit http://www.nasa.gov/shuttle. Photo credit: NASA/Frankie Martin