John B. McKay
John Barron McKay (December 8, 1922 – April 27, 1975) was an American naval officer, World War II pilot, aeronautical engineer, test pilot, and astronaut. He was one of twelve pilots who flew the North American X-15, an experimental spaceplane jointly operated by the United States Air Force and NASA. On September 28, 1965, he flew the X-15 to an altitude of 295,600 feet (90,100 m), thereby qualifying as an astronaut according to the United States definition of the boundary of space.