I grew up in San Diego in the 1950s. It was Mecca for the lovers of the sound of freedom. The two giant Naval air stations (North Island and Miramar) always had planes in the air. The massive Convair factory at Lindbergh Field regularly launched their F-102s and F-106s, and of course their enormous B-36s. I lived 10 miles from Lindbergh Field, and when a 10-engine B-36 revved up for take-off ("six turning and four burning"), it could be heard at our house quite easily. That was an awesome sound, the likes of which will never be heard again.
Another sound of freedom I used to hear regularly that has also disappeared, was the sound of an aircraft going supersonic. House-rattling sonic booms were a regular part of life in San Diego as Convair test pilots checked out their F-102s and F-106s, and Navy pilots exercised their "need for speed".
The Air Force would also pay us occasional visits. One day I heard the sound of a large four-engine plane approaching. I looked up, and directly overhead was a KC-97 at about 30,000 feet refueling a B-47 (I could see the boom glinting in the sun). While I was totally fascinated, I also thought, "I hope they don't screw this up." I only saw that once. Maybe the Air Force concluded that refueling over a major metropolitan area was not a best practice.
Finally, Convair developed and built their famous Atlas ICBM rocket in San Diego. They constructed an engine test facility in a canyon about 20 miles from our house. When they ran an engine test, it sounded as if it was about 20 blocks from our house.
Today, I don't often hear the sound of freedom, just the sound of boring commercial aircraft as they they approach or depart DFW. But if I hear the sound of a military aircraft, I'll go out and look.