When I was a kid in St. Louis in the 1960's you'd hear a few sonic booms every week.
McDonald Douglas was based in St. Louis and deep into production of supersonic jet fighters at the time. My dad worked on the F4 Phantoms and they were capable of over mach 2.
Yup!
Just like BC38, I grew up in St. Louis during the '50s and '60s and sonic booms were not uncommon.
During the '70s, I ran a motorcycle dealership less than one mile from Lambert Field, where McDonnell Aircraft (later McDonnell-Douglas) was located (still there) and the Missouri Air National Guard was based (since relocated).
All sorts of commercial and military aircraft overhead.
Watching a big fat L-1011 lumbering skyward after take-off was amusing to me. (Reminded me of a fat turkey struggling skyward.

)
Hugh Hefner kept the Playboy Bunny jet there for a few years.
Watched countless Missouri Air National Guard F-4s and then F-15s take off and land in groups of four. (The F-4s were smoky.)
Often, we would hear the thundering of dual afterburners vastly overwhelming all other sounds, and it would be a new F-15 or F-18 making a "Viking Ascent" straight up into the sky.
Quite a few of my customers were McDonnell-Douglas employees, and I asked them if the "Viking Ascent" was for test purposes or merely "showing off"?
"Nope", they told me.
The traffic around Lambert Field (later St. Louis International Airport) was so busy that when they got clearance from the tower, they were instructed to go straight up, both after burners blazing, so they could quickly clear the pattern and the civil aviation people could get back to their take-offs and landings.
I always needed to look much higher in the sky than from where the sound seemed to be coming, to get a glimpse of a silver bird disappearing in to the blue.
I still have a couple of pictures around here that I got from a fellow who worked in the engine test cell.
Airplane tied down, both engines at full burn.
The thrust diamonds in the fire cones are impressive.
John