Flight 87 of the North American X-15 was a test flight conducted by NASA and the US Air Force in 1963. Piloted by Robert A. Rushworth it reached an altitude of 86.7 km. June 27, 1963 at 17:56 UTC · Launch Successful North American X-15 — United States Air Force, to Suborbital Edwards Air Force Base, Air launch to Suborbital flight Crew: Robert A. Rushworth Program: X-15 Data: Launch Library 2, The Space Devs. Image via The Space Devs.