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?
Sentence (from "X-15 Flight 91"): The altitude was the highest manned flight by a spaceplane to that time and remained the record until the 1981 flight of Space Shuttle Columbia.
Relevant evidence: No