A view reveals the underside of Discovery the ferry flight doors are being installed.

Inside Orbiter Processing Facility-1 at NASA’s Kennedy Space Center in Florida, a long-angle view reveals the underside of space shuttle Discovery where the ferry flight doors are being installed.

The work is part of the Space Shuttle Program’s transition and retirement processing of shuttle Discovery, which is being 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 a NASA Shuttle Carrier Aircraft modified 747 jet to Dulles International Airport in Virginia on April 17 and then moved to the Smithsonian for permanent public display on April 19. For more information, visit http://www.nasa.gov/shuttle. Photo credit: NASA/Jim Grossmann