The X-59 is designed by NASA so that when flying at supersonic speed, people on the ground hear nothing but a quiet, thudding noise, if at all.
It is the X-59 QueSST (Quiet Supersonic Transport) plane, which you can see in the following video, and it will start flying in 2021, becoming the first manned silent supersonic warning device.
X-59 QueSST
According to NASA, construction of the X-59, under a $ 247.5 million plus incentive cost contract , continues at Lockheed Martin Aeronautics Company’s Skunk Works factory in Palmdale, California.
Final assembly and integration of the aircraft systems, including an innovative external cockpit visibility system, is planned for late 2020.
Currently existing restrictions only allow commercial supersonic aircraft to fly over the ocean due to the sonic boom that people on the ground hear. During the 1960s, when the United States and Europe developed civilian supersonic transport (the SST and Concorde, respectively), there were complaints about the nuisance posed by sonic blasts from aircraft. Thus, a new era of supersonic flight begins .