Question: who piloted the x 15?
Answer: William H. Dana piloted the final flight on October 24, 1968. During the research program, the aircraft set an unofficial world speed record of 4,520 mph (Mach 6.7 on October 3, 1967, with Air Force pilot Pete Knight) and set an altitude record of 354,200 feet (on August 22, 1963, with NASA pilot Joseph Walker).