S1, E5: October 14, 1947: The sound barrier (Mach 1), during level flight, was officially broken by an American aircraft, the Bell X-1 flown by test pilot Chuck Yeager from what is now Edwards Air Force Base in California. Yeager had named the aircraft 'Glamorous Glennis' after his wife. Yeager retired from the Air Force in 1975 as a Brigadier General. The Age of the Super Sonic fighter was born.