John Barron McKay

John Barron McKay 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. However, this altitude did not surpass the Kármán line as defined by the FAI, the FAI-accepted boundary of 100 kilometres (62.1 mi).

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