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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.
Read about the SR-71 Blackbird mentioned in the article here. 1  The XB-70 Valkyrie (also mentioned in the article) 2  The worldâs fastest (rocket-) aircraft, the experimental X-15. 3  The fastest interceptor ever built, the Mikoyan MiG-25 Foxbat.