The water is boiled to thermo-nuclear levels so I'd be shocked if anything nasty could survive it - certainly the flavor can't!

I'm not sure if it's because there's more content available these days, but the "germs are everywhere" movement has far greater prominence than when I grew up. We'd spend all summer barefoot, put our hands in places they shouldn't and then in our mouths, eat food that we almost certainly shouldn't have and yet we somehow survived.

There's some things that we absolutely shouldn't consume, but airplane tea and coffee are pretty low down that list.