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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.
Fifth-generation fighter jets, those that went into production after 2005, are actually considerably slower than many jets from the 1960s and 1970s. Eight of the 10 fastest air crafts on record were developed before 1965, and the fastest jet in the world, the X-15, was first flown in 1959 and retired in 1970.