Fat people should have to buy 2 seats on an airplane

https://lemy.lol/post/56423131

If you’re thinking of this, consider that those who buy clothes in XS have to pay the same amount as the XXL size for that same shirt or pants. Despite the XS garment being a third as much material and stitching.
The extra material and stitching you are talking about costs less than a US penny for any manufacturing process.