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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.
Assuming that you have a magically infinite fuel source, it really depends on the plane. The F-86 Sabre (D variant) could go 698 mph, faster than a 747. That means that it would be possible to travel around the world in about 35.67 hours. However, another plane easily beats that time. And it is beautiful. The SR-71 Blackbird has set the current airspeed record at 2,193.19 mph (3,529.6 km/h).