Rumored to be the loudest airplane ever made. XF-84H Thunderstreak (commonly know as the Thunderscreech). It only flew 12 times, all but one flight ending in an emergency. It was so loud it had to be towed miles from the tower at Edward’s AFB because of the tremendous noise it made, even at idle power. The story is kind of hilarious (except for the part where it injured people with the noise). Read up on it. You won’t be disappointed. Only 2 were built (I think). One is in the Air Force Museum. I’m going to see it sometime this summer if I can make the time.