NASA's four Gulfstream II business jets, used to train space shuttle pilots in the skills of approach and landing. Pilots assigned to a shuttle mission receive about 100 hours of STA training, which is equal to 600 shuttle approaches. Each of the aircraft has been modified to fly like a space shuttle during landing. The STA also simulates the shuttle's high speed and steep angle of landing by putting its engines in reverse thrust and lowering the main landing gear.
Subjects: Astronomy and Astrophysics.