Can any jet go Mach 9?
Can any jet go Mach 9? 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.
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