So who pays the difference in cost?
Other passengers, in the form of ticket prices.
I am amazed that the airlines haven't consider the obvious neutral option: price tickets by the pound, for the passenger and all accompanying baggage, including carryons.
Everybody wins.
I am amazed that the airlines haven’t consider the obvious neutral option: price tickets by the pound, for the passenger and all accompanying baggage, including carryons.
It may not be strictly linear, and passenger weight is self-loading, while you need to hire employees to process bags, but there ought to be a way.
They should offer fatties the chance to buy 1.5 seats, and share a triple with another fatty.
They have those bins to measure your carry-ons. Why not a test seat for fatties? And if they can’t fit, there should be a special no-fly list so airlines know to sell two seats, or insist on selling the upgrade.
When a fatty buys a single seat they know won’t fit them without using up my paid space, they are demonstrating the height of anti-social rudeness.
Then, there was the time when I sat next to the steroidal freak bodybuilder, and the male (ahem) flight attendant took HIS side when he was flexing his muscles well into my space...