Bin Hogs: People who load their carry-ons sideways and/or put every thing they own in the bin, taking all the shared space.
Also related: People who put their carry-ons in the bin, only to jump up every 4.5 nanoseconds to retrieve or return an item.
People who don't observe an orderly disembarkation. Let the folks in the row ahead of you get into the aisle before you jump ahead and block everyone with your carry-on.
People who use your seatback to get up. There's nothing like getting jolted out of a sound sleep by the guy behind you.
Women with long hair who toss it over the seatback, blocking your screen.
People who put their feet up in the armrest gap between seats.
People who demand you give up the seat you paid a premium for so that they can sit together.
Women with micro-bladders who need to get up and pee every 14.5 seconds, yet keep guzzling from their 15 gallon water bottle to stay hydrated.
IFE that requires you sit through 15 minutes of advertising to watch a 20 minute TV episode. (Air Canada, I'm looking at you!)
Legroom taken by IFE boxes.
Absurdly small seat-back pockets. (United, step forward)
Overly chatty in-flight announcements.
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If any of the above gives you the impression I'm a grumpy flyer, I'm actually not. I board, I sit down, I rarely get up out of my seat. I watch IFE, look out the window, or snooze. I don't make any demands of the crew, and rarely chat with seat mates.
Look, it's been swell, but the swelling's gone down.