As suggested by me some time ago -

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Airlines should make heavier passengers pay more for their plane tickets and lighter ones less, it has been suggested.

The controversial pay-as-you-weigh pricing scheme has been mooted by a Norwegian professor who argues that weight and space should be taken into account by airlines pricing their tickets.

news.sky.com/story/1069283/fat-chance-of...t-you-weigh-airfares

Lets start with buses and make the lard-arses pay double (as they occupy at least double space)

he's a cross between Thatcher and Stalin

Being light in the brain cell dept will save you s few bob ITK!

Seems very sensible idea to me

They might loose larger customers if they did that...