The Shuttle Carrier Aircraft (SCA) are two extensively modified Boeing 747 airliners that NASA used to transport Space Shuttle orbiters. One is a 747-100 model, while the other is a short range 747-100SR.

 

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Photos By;
NASA/Jim Ross, U.S. Air Force/Senior Airman Jet Fabara,
NASA / Carla Thomas - Armstrong Photo Gallery, Kirbstr - Took photo at Uvdar Hazy Air and Space Museum