Boeing 747 / Piggyback Space ShuttleNASA 747 with Shuttler carrier model. NASA uses two modified Boeing 747 jetliners, originally manufactured for commercial use, as Shuttle Carrier Aircraft (SCA). One is a 747 100 model (NASA 905), while the other is a short range 747 100SR (NASA 911). The two aircraft are identical in appearance and performance. The SCAs are used to ferry Space Shuttle orbiters from landing sites back to the Kennedy Space Center launch complex in Florida and also to
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