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Space Shuttle Endeavour piggyback flight. View of the Space Shuttle Endeavour being flown over Houston, Texas, USA, mounted to the back of a NASA 747 Shuttle Carrier Aircraft (SCA). Endeavour was the fifth and final operational shuttle built by NASA. Photographed on 19th September 2012. (KEYSTONE/SCIENCE PHOTO LIBRARY/NASA/Sheri Locke/SCIENCE PHOTO LIBRARY)