[GiraffeNecktie]

This would be pretty much impossible for an existing airline to implement but what a great disruptive concept for a new discount airline startup. Your ticket is based on your total weight (body plus baggage) which means it would be totally attractive to anyone who is skinny and travels light (plus you're less likely to be squeezed in between two oversized seatmates). Sure you give up the heavy clientele but you gain a lock on an attractive slice of the market.