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The Bell X-1 was a rocket-powered aircraft developed for the National Advisory Committee for Aeronautics and the US Army Air Forces that first flew in 1946. Intended for research into transonic flight, the X-1 became the first aircraft to break the sound barrier. The historic flight took place at Muroc Army Airfield on October 14, 1947 with Captain Chuck Yeager at the controls. Over the next several years, a variety of X-1 derivatives were developed and used for aeronautical testing.