Incredible View! usa NASA Boeing 747 landing in San Francisco with Space Shuttle.

USA NASA Boeing 747 landing in San Francisco with Space Shuttle.

NASA, the United States' Space Agency, has previously employed two modified Boeing 747 airliners in its fleet, used to transport its Space Shuttle orbiters. These two aircraft were two different variants of the Boeing 747, and were often used on different missions. Both Shuttle Carriers have been retired by NASA since 2012; however, they have both been preserved and are on display to the public.

Boeing 747-100 that NASA used to transport its Space Shuttle orbiters. The aircraft was initially delivered to American Airlines in 1970 with the registration N9668. However, subsequently, the aircraft was transferred from American to NASA in July 1974, and its registration was changed to N905NA. The aircraft was initially purchased by NASA for the research of trailing wake vortex research. NASA then decided to convert the aircraft to carrying space shuttles.