supersonic

A supersonic thing or object can move faster than the speed of sound. Airplanes that go this fast create a sonic boom when they break through the air.

When we talk about supersonic things, it's usually about travel and speed. A lot of people are interested in how fast planes can fly. Some military jets are designed to be supersonic, which helps them get places quickly during emergencies or missions. The fastest civilian jet ever made was a Concorde, a plane that could take off from London and land in New York in just under four hours. This speed is amazing for regular travelers, but it's not something you'll find on commercial flights today - most planes can't go fast enough to break the sound barrier safely without putting people at risk.