Does it matter which side of the plane you are on or how close to the wing (engines) you are? I could imagine an audio difference between left and right if you were sitting at a window near an engine.

I did sit on both sides (one flight was next to wing) - did had same issue both times.

One thing that was common- I was sitting in a window seat.

Just got back from another flight, where my seat was in the middle of airplane (3 set of rows). No issues whatsoever. One thing I’ve noticed, if I press AirPods harder, I do start hearing hissing in my ears.