I don’t see the problem. If fat people cost more to serve, charge them more.
1. Fat people need to quit their whining.
2. Non-fat people need to quit their hateful crap.
But charging more because of higher costs to serve? Where’s the problem?
I have always believed that airline ticket prices should be per pound. Weigh each person with all his luggage, everything that is going aboard attached to that person and per pound him. Considering the other costs that are not so weight related, a base price per ticket with an additional per pound charge. That sort of pricing would justify a mix of seat widths.