I’ve regularly skimmed through this thread but haven’t read all of it. I didn’t see the following point being made; if it has been, please disregard this then.
AFAIK most posters agree on the unspoken assumption that if obesity is non-voluntary, people who suffer by it should not have to pay an additional charge. Actually this assumption is invalid as a fact of life. Most people who suffer from one or other physical disadvantage have to suffer additional costs as well, even while the government may try to alleviate some of it. Being handicapped is never compensated fully. Furthermore people with handicaps are not always allowed the same freedom as others.
One simple example: sight. I’ve got glasses/contacts and I have to pay for them. Insurance will not completely cover it. I don’t mind (and is not very costly), but it sure as heck is involuntary.
Another example is not being able to use one’s legs: this will make it very difficult to drive a car. You may be able to with a special car, but it will cost extra time and money. And does anyone know how handicapped people are handled on an airplane?
Actually I doubt whether many people would like to classify obesity in general as a handicap. That would put a large social stigma to it. You might say that ‘fat’ people should not have to pay for bigger seats if they can prove it is non-voluntary. Do you think many people would like to go to get a medical statement for that fact?
With respect to the original issue (although this is the Pit), I personally am rather tiny, but still wouldn’t mind particularly if airlines would use bigger seats at a higher price. But I can see that as long as ‘the public’ consistently looks for lower prices, it’s not going to happen. Maybe advertisments should state: flight $ xx for one yy inch seat. Then people could see for themselves whether they like to cough up the extra dough, or risk being crammed into a tiny seat and/or being stuck in with your next neighbour. I don’t fly so much, but using public transport (train) in The Netherlands offers similar experiences, even though train seats are more spacious than airplane seats.