X-15 Flight 3-65-97, also known as X-15 Flight 191 (due to being the 191st free flight of the X-15), was a sub-orbital spaceflight of the North American X-15 experimental spaceplane, carrying seven experiments to an actual peak altitude of 266,000 feet, above NASA's definition of the start of space at 50 miles, but below the Kármán line. It took place on November 15, 1967, and was piloted by Michael J. Adams. It ended in tragedy when the aircraft broke apart minutes after launch due to technical difficulties, killing the pilot and destroying the plane.