Follow-up to Charging by Weight

Flying in Canada, you can get another seat for free...but you have to qualify as obese.

In a previous post I guessed about how much people pay for fuel. I estimated that about 5% of a ticket's cost on long-distance, crowded flights is the weight of a person and his/her luggage.

In case the previous post wasn't clear, I think that airlines should be allowed to charge a passenger for his/her weight and baggage's weight. Thus I disagree with the Canadian ruling, though I can think of a few arguments for it.