My annotation: for some reason his name in Aviation Week | December 22, 1947 is spelled "Yaeger".*
The Bell XS-1 has flown faster than the speed of sound. First piloted flight through the transonic zone was made by Capt. Charles Yaeger of the U. S. Air Force more than a month ago. This flight and several subsequent penetrations beyond mach 1 by Yaeger and NACA test pilots Howard Lilly and Herbert Hoover have been shrouded in heavy official secrecy.
Altitude Record — All of these super-sonic flights have been made at the Air Force's Muroc, Calif. Desert Flight Test Center. Flights were timed by radar tracking at altitudes of from 40,000 to 70,000 ft. setting new altitude records for airplanes. Biggest surprise was the ease with which these historic flights were exe-cuted. None of the pilots experienced any undue difficulties during their supersonic flights. Severe stability, control and structural load problems, generally anticipated, failed to materialize.
-Aviation Week | December 22, 1947
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