This is an aerial view of space shuttle Discovery bolted to the top on the ramp of the Shuttle Landing Facility SLF.

This is an aerial view of space shuttle Discovery bolted to the top of a Shuttle Carrier Aircraft SCA on the ramp of the Shuttle Landing Facility SLF at NASA’s Kennedy Space Center in Florida. The mate/demate device, known as the MDD, also is in view and is where transition and retirement teams prepared the duo for the ferry flight. Discovery's last crew members are expected to be at the SLF, along with Kennedy employees and guests, as the center says goodbye to the agency's most-flown shuttle on April 17. The SCA, designated NASA 905, will ferry Discovery to the Washington Dulles International Airport in Virginia, after which the shuttle will be moved for public display in the Smithsonian's National Air and Space Museum Steven F. Udvar-Hazy Center on April 19.

For more information on the SCA, visit http://www.nasa.gov/centers/dryden/news/FactSheets/FS-013-DFRC.html. For more information on shuttle transition and retirement activities, visit http://www.nasa.gov/transition. Photo credit: NASA/Kim Shiflett