Gotcha, good to keep in mind. I can't /stand/ dirty fart tubes (though, recently I used Delta and it was fine), but otherwise haven't flown much in the past 5 years.
If you want to go the extra mile (no pun intended), when flying out of an airport that is a major airline hub, avoid that airline at all costs i.e. don't fly United out of EWR, American out of MIA, etc. They tend to be ridiculously busy and crowded.
