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Speed of Sound vs. Sound of Speed

On October 14, 1922, Lt. Lester Maitland was first to fly an airplane faster than 200 miles per hour (actually achieved 216.1 mph).

On September 4, 1933, James Wedell was first to fly an airplane faster than 300 miles per hour (actually achieved an average speed of 305 mph).

On June 19, 1947, Col. Albert Boyd was first to fly an airplane faster than 600 miles per hour (actually achieved 632 mph).

On November 20, 1953, Scott Crossfield was first to fly an airplane faster than 1300 miles per hour (actually achieved 1327 mph).

On November 9, 1961, Major Robert white was first to fly an airplane faster than 4000 miles per hour (actually achieved 4070 mph).

Question: Based on the above data, when should someone have been the first to fly an airplane faster than the speed of sound (i.e. break the sound barrier)? The speed of sound is 760 mph at sea level.



Note: Major Chuck Yeager did it on October 14, 1947, and actually achieved a speed of 967 mph.