NASA is actually working on this, if I remember correctly. They want it to be a "low boom," apparently it's still a work in progress. https://www.washingtontim

NASA is actually working on this, if I remember correctly. They want it to be a "low boom," apparently it's still a work in progress. https://www.washingtontimes.com/news/2018/nov/6/nasa-quiet-sonic-boom-tests-rattle-galveston-texas/ https://www.washingtontimes.com/news/2018/nov/6/nasa-quiet-s...