Plenty of heavy people fly places! I have weighed as much as 340 before, and still flown coach. No, I did not cross into my neighbor's "space" either. The guy should probably have two seats if he's flying coach, but I doubt he'll suffer any medical difficulties as a result. This all depends on his height, too. If he's 5-3, he's got a real problem.

There are football players and sumo wrestlers that size or bigger who fly all the time. Being 6-3 and fat is a heck of a lot better than being SHORT. Feel sorry for them, not fat people!