Earlier quoted context omitted.
I've had funny conversations about why I still wear a good n95 on public transit (planes included). My right-leaning and remarkably well educated parents are incredulous. A few years ago I thought personal masking didn't really matter. Wow, I was wrong! And not catching bs colds from weirdos on the bus or the grocery store makes it worth it. My face isn't that pretty anyway.
They might be right about the actual plane ride because the filtration systems on modern (read 20 years old or newer) are really good. Public busses tend to be a disaster for air filtration though, especially in winter when no windows are open. I wish there was some better research/more accessible research on this.
I've been on a handful of flights in the last 2 years where the air system didn't work at all, and others where the climate control system was otherwise failing (80°F). This is accentuated by stale air when you embark and disembark when the aux generators aren't providing power.