July 19, 1963: Cracking the 100-Kilometer-High Barrier … in a Plane
• http://www.wired.com, By Tony Long1963: Test pilot Joe Walker takes an X-15 aircraft to an altitude of 67 miles (106 kilometers), becoming the only pilot to surpass the 100-kilometer barrier in a rocket plane until Mike Melvill, piloting SpaceShipOne, duplicates the feat in 2004.