Big people have to eat more too, so they spend more on food. Isn't that penalizing people based on their size too? There is a plus side though, if you have a

Big people have to eat more too, so they spend more on food. Isn't that penalizing people based on their size too? There is a plus side though, if you have a family with small kids, the cost of the flight might only come out to be a 2-person cost.