The NASA/USAF X-15 is the fastest fighter jet ever produced. It reached record top speed of Mach 6.72 or 4,520 mph, which is more than five times the speed of sound.
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No airplane has ever gone this fast. The speediest airplane ever built is Lockheed's SR-71 Blackbird, which traveled at Mach 3.2. Anything above Mach 9 and you lose communications with the ground, as plasma starts enveloping the vehicle, as if it were a spacecraft returning to Earth through the upper atmosphere.
Falcon HTV-2 is an unmanned, rocket-launched, maneuverable aircraft that glides through the Earth's atmosphere at incredibly fast speeds—Mach 20 (approximately 13,000 miles per hour).
Top speed is the maximum speed a fighter aircraft can achieve in flight. This speed depends on the design of the aircraft and the power of its engine. Modern fighter aircraft generally have a top speed of Mach 1.5 to Mach 2.5 (about 1,800 to 3,000 km/h), depending on the aircraft type.