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It's hard to say. Officially, the fastest jet plane ever built is the SR-71 Blackbird, built by Lockheed. It was capable of speeds in excess of 3.5 mach (more than 2,200 miles per hour). It was decommissioned in 1998.
What is the Fastest Airplane in the World? The Lockheed SR-71, the fastest airplane in the world. Though not the world's absolute fastest aircraft, the Lockheed Martin F-22 Raptor can accelerate to and sustain supersonic speeds without the use of its afterburners. The Boeing 747 has a cruise speed of 550 miles per hour, which is actually faster than the top speed combat fighters could achieve in World War Two.