And in the months since, haven't been on one.

I guess my feeling now is that close quarters with that many people for that long, without a place to get fresh air, etc feels a bit dangerous now. Which is definitely part paranoia, I'm sure. But a friend told me he'd adopted masks on planes before the pandemic and found it to be something that helped not feel dried out when he landed, so I'll give that a shot. If you feel refreshed after a flight while wearing a mask, I don't care if it's placebo - I need that.