3-view of NASA's Boeing 747 Shuttle Carrier Aircraft. NASA uses two modified Boeing 747 jetliners, originally manufactured for commercial use, as Space Shuttle Carrier Aircraft (SCA). One is a 747-100 model, while the other is designated a 747-100SR (short range). The two aircraft are identical in appearance and in their performance as Shuttle Carrier Aircraft.
http://www1.dfrc.nasa.gov/Gallery/Graphics/B-747-SCA/index.html (direct link)  Transferred from en.wikipedia to Commons. by User:TheDJ.
NASA/Dryden Flight Research Center