B1 bomber breaking the sound barrier. I've seen & heard this in person numerous times... Sounds like the worlds largest cannon was just fired, but it's really cool to see. Smaller aircraft breaking the sound barrier are not as impressive as seeing & hearing this big girl doing it.
A gallery of incredibly fast and expensive airplanes breaking the sound barrier and thus travelling at supersonic speeds. That means they are going faster than 343 meters per second (1,125 ft per second). via twistedsifter.com