US airline plans to buy 15 new supersonic aircrafts by 2029

According to details, supersonic flight is when a jet travels faster than the speed of sound. Usually the plane is flying at an altitude of 60,000ft (18,300m) faster than 660mph (1,060km/h).

Back in 2003, the supersonic passenger flights ended operations when Air France and British Airways retired Concorde.

The new Overture aircraft will be produced by a Denver-based company called Boom, which has yet to flight-test a supersonic jet.

A typical passenger jet may cruise at about 560mph (900km/h) but Overture is expected to reach speeds of 1,122mph (1,805km/h) - also known as Mach 1.7.

At that speed, journey times on transatlantic routes such as London to New York can be cut in half.

Boom says Overture would be able to make the trip in 3.5 hours, shaving three hours off the flight.

Concorde, which entered passenger service in 1976, was even faster with a maximum speed of Mach 2.04 - about 1,350mph (2180km/h).