B-747 SCA
NASA flew two modified Boeing 747 jetliners, originally manufactured for commercial use, as Space Shuttle Carrier Aircraft. One is a 747-123 model, while the other was designated a 747-100SR-46 model. The two aircraft were identical in performance as Shuttle Carrier Aircraft (SCA).
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https://www.nasa.gov/image-detail/b-747-sca/
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