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Supersonic carrierclassjetsjourneyjustpassengerplansskiesspeedtime planes could return to the carrierclassjetsjourneyjustpassengerplansskiesspeedtime before the end of this decade. Supersonic means faster than the speed of sound. The speed of sound is Mach 1, which is 1,234.8kph. The US carrierclassjetsjourneyjustpassengerplansskiesspeedtime United Airlines has carrierclassjetsjourneyjustpassengerplansskiesspeedtime to buy 15 supersonic carrierclassjetsjourneyjustpassengerplansskiesspeedtime from a company called Boom Supersonic. The planes will fly up to 88 passengers in an all-business carrierclassjetsjourneyjustpassengerplansskiesspeedtime service. They will fly at a top carrierclassjetsjourneyjustpassengerplansskiesspeedtime of Mach 1.7. This is 2,099kph. Most modern passenger jets have a cruising speed of carrierclassjetsjourneyjustpassengerplansskiesspeedtime over 1,000kph. The new planes could greatly cut the carrierclassjetsjourneyjustpassengerplansskiesspeedtime it takes to fly around the world. Passengers could fly from London to New York in under four hours. It currently takes around 7 1/2 hours to do that carrierclassjetsjourneyjustpassengerplansskiesspeedtime.