Human Nature: Science, Technology, and Life.

Fat and Plane Seats

United Airlines has just implemented a tough policy for fat people: If you're too big to fit in a coach seat on a full plane, you'll have to pay for a first-class seat or two adjacent coach seats. And if those options are sold out, you'll be bumped from the flight.

I have a better idea: I'll sell you part of my seat.

More here.