Question: This flight, the first of a reused spacecraft made the pilot of the mission qualified under the rules of the U.S. Air Force and the Fédération Aéronautique Internationale a what?
{'answer': 'astronaut', 'supporting_facts': [['X-15 Flight 91', 0], ['X-15 Flight 91', 2], ['X-15 Flight 91', 3], ['Joseph A. Walker', 2]]}