Sometime when the Airforce reserve guys are "playing" in their F-16s at Carswell, drive over and sit and watch.
They will spend hours at a time doing aerobatics that shouldn't be possible all inside the boundaries of the base.
As they do, vapor trails form fron various parts of the plane, well below the speed of sound (the currents of air flowing around parts plane may well be super-sonic with the airspeed of the plane at half-sonic or less).
Watch particlularly at wing roots where they join the fuselage, that's the point where vapor seems to form first (above the wing, where the presures are lowest), then the wing tips and tail tips.
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