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Basically, your 1k tone would cease to be in your hearing range.

Because while it is travelling at the speed of sound, there will be a continuous build up of sound around the aircraft.

Obviously it depends on the sound, but would one hear a sort of segment of time stuck like a granular synth or maybe some very slow oscillating and modulating mesh mash of frequencies? The pressure wave bouncing off the plane would be traveling at the speed of sound if it didn't run into the shock wave, which travels slower than the speed of sound relative to the exiting air which is on the plane side of the shock wave.

Wind speed and the speed of sound are completely different things.

Kayne The speed of sound varies depending on , temperature and the medium through which it travels.

When you pass Mach 1, the plane travels faster than the waves itself and that move across the so-called sound barrier produces a large sound, which is the sonic boom.

Even the slowest handguns shoot a bullet at 760 miles per hour, SciAm explains.

As new sounds are produced, the aircraft will fly along with those new sounds - and so on.

The reason for this variance is that sound waves travel by exciting molecules.