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Well it really depends!!! At takeoff the estimated speed for a jet plane is around 450-600 MPH. It depends on its weight, amount of passengers, amount of luggage and other things of that sort. Commercial jet aircraft fly at about Mach 0.88 -- around 500 statute miles per hour.
Current commercial aircraft fly with a cruise speed depending on the model and make of the aircraft that ranges between Mach 0.81 through Mach 0.86, that is a speed in the range of 900 km per hour. We call this subsonic flight. Concorde flew with a cruise speed of about 2,100 km per hour. The future generations of very fast commercial aircraft will fly with speeds of 4-5 times the speed of sound, that is in the range of 4,000-5,000 km per hour. History of supersonic flight. Development of supersonic flight started already in the early fifties of the 20 th century, initially