When does a jet break the sound barrier?

A jet breaks the sound barrier when it reaches a speed of approximately 343 meters per second (1,125 feet per second) at sea level, which corresponds to Mach 1. This speed varies with altitude and temperature, as sound travels faster in warmer conditions. When a jet surpasses this speed, it creates shock waves that can result in a sonic boom. The transition from subsonic to supersonic flight typically occurs during takeoff or during high-speed maneuvers.