NASA's X-59 Experimental Aircraft Breaks Sound Barrier for First Time

Summary

NASA's experimental X-59 aircraft achieved supersonic flight for the first time on June 5, reaching Mach 1.1 (approximately 713 mph) at 43,400 feet during an 81-minute flight. Test pilot Jim "Clue" Less reported the transition to supersonic was so smooth that instruments were the only indication, exactly matching the team's design goals for the quiet supersonic technology demonstrator.

Source

bskyNASA's X-59 Experimental Aircraft Breaks Sound Barrier for First Timenasa.gov