Somewhat related:
Many years ago in another life I observed a practice firepower demonstration on the Nellis range (the real one was for NATO bigwigs a day or two later.)
Part of the demo was a supersonic on the deck flyby by a F-105, F-4 and F-111.
You really had to be looking at where you knew it was coming from or you wouldn't see it till it was past and the sonic boom hit.
They would also be creating a rooster tail in the ground from the sonic boom.