N905NA(20107) NASA's shuttle-carrying 747, N905NA, in the static park at the 2002 Davis-Monthan airshow. The aircraft originally flew for American as N9668 before conversion
N931NA(18615) NASA's famous "Vomit Comet" N931NA retired to the Pima Air & Space museum in 2003. The aircraft was used to simulate weightless conditions for astronaut training