Earlier this year, NASA awarded $250,000 to Lockheed Martin to create an aircraft capable of silently breaking the sound barrier (“Low-Boom flight program”).
On Nov. 16, the company LMT, -3.39% started production of the experimental QueSST (Quiet SuperSonic Transport) aircraft. This elegant vehicle can cruise at Mach 1.42 (1,510 km/h or 940 mph) and is capable of reaching 55,000 feet (16,800 meters), creating a low 75 Perceived Level decibel (PLdB) thump. This means that when the airplane breaks the sound barrier, it creates noise equivalent to the sound of slamming the car door.
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Image from www.lockheedmartin.com