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What is the top speed of an airplane?

There is no one definitive answer to this, as it depends on the type of aircraft. Generally speaking, the fastest airplanes are military jets, such as the Lockheed Martin F-22 Raptor, which has a top speed of Mach 2.25 (approximately 1,555 mph). Among commercial airliners, the Airbus A380-800 has a top speed of Mach 0.89 (approximately 560 mph).