Considered The Most Successful Aviation Research Program Ever, The X-15 Proved That Manned Aircraft Could Return From Earth Orbit, And Be Flown To A Pre-Determined Landing Place.On November 9, 1961, The X-15 (Ship 2) Flew To 4,093 Mph Piloted By U.S. Air Force Major Robert M. White. This Was Mans First Flight To Mach 6.The X-15 Flew From Edwards Air Force Base, California.