Normal passengers should not be forced to subsidise passengers of size

Final remarks to pro's counterpoints 1) Giving up your first class seat to someone who arguably needs it more may not be considered "foolish" It is an act of courtesy and forcing fat people to buy another seat would eliminate this much easier solution to the problem 2) Even if a plane is fully loaded or not it is up to the flight attendants to ultimately decide what should be done in this situation. Your policy of forcing all fat people to pay for another seat may only become an issue when they board the plane because you cant determine beforehand whether or not a large person will not fit comfortably in the seat. The guidelines would not eliminate all cases of people being too fat for their seats. If this problem is seen though flight attendants would be forced to immediately kick the person off the plane, even though before hand the same airlines said he did not have to buy another seat but are currently saying that now he has to only AFTER he boarded the flight. Having the person switch with someone in first class who is willing to sit in coach could solve this problem On another note if these guidelines were installed and someone was forced to buy two seats but turns out they can fit comfortably into one seat then havent the airlines just committed fraud or extortion to a degree on the fat person? 3) So you agree that it does not affect everyone on the plane like you originally claimed 4) Tall people only fit uncomfortably in one direction, downwards. Fat people though fit uncomfortable both forward, and to both sides so they do suffer from small seats more than tall people do. You actually bring up a good point because the fat person gets upgraded because it helps them and the people sitting nearby, however you also show how tall people do NOT do this so then why would they have an equal claim to get an upgrade as fat people? Fat people fit uncomfortably in many directions and can unintentionally irritate other passengers, Tall people only fit uncomfortably in one direction and does not irritate anybody at all So then wouldnt fat people still have a greater claim to a free upgrade? If not then what am I missing? 5) There would be a problem because then you are kicking a person off a plane for taking up too much space when there is a perfect place for them to sit for the flight. Kicking a fat person off a plane for taking up too much space when space is available doesnt make sense at all 6) You claim it depends on the number of upgrades on each flight, but I have already argued how this problem is a rare occurrence and usually happens once, if at all. I have also shown how the rest of the flight dont really pay for the fat persons upgrade, and even if that were the case the price they were to pay would be less than a cup of Coffee at Starbucks 7) Rather than make everyone equally comfortable on the plane you are arguing that for those who are not comfortable then they should have to go through the discomfort of paying TWICE as much money to fly on a plane? Does not sound like the correct solution to me. I will close with this statement. Fat people only occasionally get upgrades to first class on airplanes, and when they do it is because of the courtesy of the flight attendants who identified the problem and solved while keeping everyone happy. Making them pay twice as much for seats they may manage to fit into comfortably before they board the plane or kicking them off the plane when they were already told beforehand they would not have to buy another seat is not the best solution. It is better to allow the flight attendants to address this rare problem rather than have each and every airline create their own policy towards it which might not solve the issue or cause other problems to arise