Boeing 747 - NASA Space ShuttleNASA 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 747 series of aircraft are four engine intercontinental range, swept wing "jumbo jets" that entered commercial service in 1969. The two SCAs are under the operational control
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