I have never had the absolute horror of having to sit next to a troglodyte on any of my long flights from Asia to US flights. I consider my self lucky in this sense but I am 6'2" and I pay extra for extra legroom. Fatties should definitely pay up for extra flank room. Bonus story: A fatty paid for an economy plus seat two seats from me in the same row. She complained the whole time about pressure in her ham stacks she called legs. Never happy no matter what. Fucking buffet rapists man...