I'm not exactly a "frequent" flyer, probably a half dozen trips per year. I'll use Delta or United, or SW with the $25 earlybird option, depending on the flight schedule, where the layover is, etc. I HATE American and I won't mess around with those "budget" airlines like Spirit or Frontier, either, 'cause you're not gonna convince me that you saved me $100 on a ticket by not giving me 6oz of Sprite....that savings came out of something I would have preferred spending the money for.
I'm not nervous about flying generally, but I don't like turbulence and I don't like being trapped where I have to bother somebody to get up and let me out....even moreso if they're sleeping, because it just feels rude. So, I always book aisle seats because I drink enough water that I won't finish a 90+ minute flight without hitting the lavatory. The last time I flew American they moved me from the aisle seat I'd selected weeks before and put me in the middle seat. I didn't know until I was at the gate and my mobile boarding pass wouldn't load. Had to go to the agent, who handed me a paper ticket for a middle seat between two passengers that were each twice my weight and encroaching on my personal space. The flight started off turbulent and I spent 3 hours from PHX to OKC being sweat on by two strangers...my anxiety built my stomach acid up so bad that it actually made me feel like I was gonna puke, gave me the sweats and I couldn't eat for the rest of the day.