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What is fastest jet fighter what its speed?

Fastest Jet Fighter: The Lockheed SR-71 Blackbird is the fastest jet fighter ever built.

Speed: The SR-71 Blackbird holds the record for the fastest air-breathing manned aircraft, achieving speeds of Mach 3.3 (approximately 2,193 miles per hour or 3,527 kilometers per hour) at altitudes above 85,000 feet (25,908 meters).