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When an object (aeroplane) breaks the sound barrier and has a greater speed than sound waves it is considered to be supersonic.
In order to do so it needs to travel faster than sound in air 343 m\s approx, in order to be classified as a supersonic object.

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The first supersonic transport (SST) was the Soviet Tupolev Tu-144, which had its first supersonic flight in June 1969.

France, Russia, United States and United Kingdom have their own supersonic transport planes.

https://www.youtube.com/watch?v=pDhreOMwZ-c

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Supersonic Travel: United Airlines Signs Deal To Buy New Planes

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If it is not obvious yet supersonic travel can cut the time taken to travel t places by half!

It travels at such a fast speed that more passengers can be carried per day by aeroplanes which will lead to a rapid growth in the tourism industry.

According to research, supersonic planes burn 5 times more fuel than a normal plane.

Travelling at a supersonic speed can generate sonic booms (a loud sound that is similar to thunder).

Excessive sound of the sonic boom can damage eardrums and the energy generated from it can lead to widespread destruction of nearby buildings.

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A bullet fired from a gun is an example of an object that flies at supersonic speeds.

The space shuttle orbiter flies at supersonic speeds during portions of its mission.

An airplane called the Concorde was the most notable passenger airplane to travel at supersonic speeds.

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Chuck Yeager became the first pilot to fly faster than the speed of sound

The Lockheed SR-71 Blackbird is the fastest jet aircraft in the world, reaching speeds of Mach 3.3--that's more than 3,500 kph (2,100 mph)

If you were ever to be shot by a sniper, you would be dead before you know it. This is because sniper bullets travel faster than the speed of sound (supersonic).