I used to travel from Manchester to Stockholm weekly. One night on a flight to Stockholm the captain came on to tell us he was getting all the lights turned out as there was a Northern Lights display on the left, unusual at that latitude. Of course I was on the right window seat so didn’t get to see any of it but could hear the ‘oohs’ and ‘aahs’ from the passengers with a left window (who were not in a hurry to let anyone else have a look).
From that point on I’d make sure I had the ‘North’ window seat if I was flying in the dark. It never happened again on a flight I was on.