Debate: Overweight people and airplanes

[theben]

3 Questions, some stray off topic.

Should you force an overweight person to buy two or more seats on an airplane to accomodate abnormally large size, or do you allow them to squeeze into one seat and ruin 2-4 other peoples' flight?

When going on an airplane flight are you buying space or a seat for yourself, regardless of how much space "yourself" occupies?

Would you consider policy forcing some to buy multiple tickets a form of discrimination? (for that matter, do you consider being highly obese a legitimate disability like paraplegia, blindness, mental retardation, etc)