Flight 77 of the North American X-15 was a test flight conducted by NASA and the US Air Force in 1963. Piloted by Joseph A. Walker it reached an altitude of 82.7 km. January 17, 1963 at 16:59 UTC · Launch Successful North American X-15 — United States Air Force, to Suborbital Edwards Air Force Base, Air launch to Suborbital flight Crew: Joseph A. Walker Program: X-15 Data: Launch Library 2, The Space Devs. Image via The Space Devs.