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How fast is the fastest fighter jet?

The fastest fighter jet currently in operation is the Mikoyan MiG-31BM, a Russian interceptor aircraft. It has a top speed of Mach 2.83, or approximately 3,430 km/h (2,130 mph).

However, it's worth noting that the fastest ever fighter jet was the Lockheed SR-71 Blackbird, a retired American strategic reconnaissance aircraft. The SR-71 held the record for the fastest air-breathing manned aircraft, reaching Mach 3.3, or approximately 3,530 km/h (2,190 mph).