I was on a video conference call recently, with everyone working from home we are doing a lot of that these days, someone on the call had the windows open and lived near an airport, and I heard an old familiar sound, a sound that brought back memories of my youth. Piston engine - propeller driven aircraft. I miss that sound. I live about 90-seconds (by air) south of Ronald Reagan Washington National airport (DCA,) in one of the countries most strictly enforced "no-fly-zones." Air traffic is limited and strictly controlled near here in the DC area. Pilots have pass special background checks and receive prior permission to land at DCA, the bottom line is nearly no small private planes land there. I miss the sound. Hearing it brought back fond memories, when ever my father heard that sound, he would pause, look up and see what kind of airplane it was. A habit I picked up.
What sound makes you pause and look up?