Obviously insanely impressive, but I have some doubts about the actual pervasiveness of recorded aircraft noise in casual videos.

The example with two prop planes seems a bit contrived (not that it wouldn't work with jets, they are usually just much higher up and have less distinct fundamental frequencies). Having two planes within audible range (stated at ~10 km slant range in the video) is a pretty rare event for a lot of places, even in the US with widespread general aviation.