Tags: Artificialsatellite, Satellite.
X-15 Flight 91 was a 1963 American human spaceflight mission and the second and final flight in the program to achieve sub-orbital spaceflight – a flight over 100 km in altitude – which was previously achieved during Flight 90 a month earlier. It was the highest flight of the X-15 program. It was the first flight of a reused spacecraft as plane number three flew the previous sub-orbital flight on July 19. This mission was piloted by Joseph A.
