The NASA X-59 QueSST (Quiet SuperSonic Technology) is now flying and soon will start test flights aimed at reducing the sonic boom to a thump for people on the ground. Here is what to know about how the X-59 will be the first aircraft to fly with a quiet sonic boom and why this is just one major challenge facing supersonic aircraft. If this can be demonstrated, it will remove one of the biggest barriers to supersonic commercial flight. How QueSST Will Reduce Sonic BoomCredit: NASAThe issue is the N-Wave generated by aircraft like Concorde and fighter jets as they fly supersonic. To humans, the two near-simultaneous pressure changes from the N-Waves sound like "Boom Boom."