On October 14th, 1947, Chuck Yeager became the first man to fly at Mach-1 (the speed of sound). He flew the Bell X-1 at a speed of approximately 350 Meters per second. Yeager's personal best speed was Mach-2.44 (almost 2 and a half times the speed of sound).
There was not a special name for the first flight that went faster than the speed of sound. However, when a plane does go faster than sound, it said to be traveling at supersonic speeds.
it vibrates
it vibrates
There are a number of claims concerning the first plane to fly faster than sound but some of these claims can not be verified or took place in circumstances which did not count as powered level flight. It is generally accepted that first flight faster than sound that could be officially documented was achieved by Chuck Yeager on October 14, 1947.
In faster-than-sound flight, a plane can experience a shockwave known as a sonic boom. This is caused when the plane reaches and exceeds the speed of sound, resulting in a sudden, loud noise like a thunderclap. It is a strange phenomenon that can be disruptive and alarming for those on the ground.
14 Oct 1947
It was referred to as breaking the sound barrier.
Because it is travelling faster than the speed of sound, the sound comes later. However, if a fighter plane was slower than the speed of sound, you'd see the plane first.
The X-15
The first plane was the experimental Ball X-1.
The first such plane was the experimental Bell X-1.
You would hear the sound after the plane has passed.