Here's why:
* Sonic Boom: When an object travels faster than the speed of sound, it creates a shock wave. This shock wave is a sudden change in air pressure that we experience as a loud "boom." The boom is so loud it can shake windows and even damage structures.
* Engine Noise: Supersonic aircraft have powerful engines that generate a lot of noise, even when not breaking the sound barrier. This noise can be very intense, especially for those close to the aircraft.
So, while you might not hear the constant roar of an engine inside the aircraft, the sound of the sonic boom and engine noise is very much present outside the aircraft and can be heard for miles around.
Perhaps you're thinking about the *interior* of a supersonic aircraft. While it's true that modern supersonic aircraft are designed with sound-dampening materials and technologies, the interior is still far from silent. There's still a noticeable hum and vibrations from the engines and the speed of travel.
In summary, traveling at supersonic speeds is far from quiet. It's actually quite loud, both inside and outside the aircraft.
