It is because I am nearly 300 pounds and will be flying in a couple weeks to visit a friend in Minnesota. I have a condition called PCOS which makes you gain weight and is hard to lose weight. I wanted to know if most people would be understanding, or just really pissed off at me. I wish I had the money to buy an extra plane ticket but I did not. I have looked up the seat measurements and I can fit in the seats just fine but spill out over the arm rests. I have chosen seats that are the isle seats so that I can just hang over the isle except one of my seats I could not get the isle seat, so I got a window seat. I made sure that I would not ever be in the middle between 2 people, because I don't want to piss off 2 people instead of just 1. I am trying to lose 10 pounds before the trip. I have already lost 5. Maybe I can lose 10 more, to make 15 pounds lost. That is at least a little bit better. Yes there are conditions that make you overweight without meaning to be overweight. I hope the people I sit next to understand that.