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How about they charge heavier people more - that's usually not genetics

How so? Taller people are also often heavier, simply due to the fact that they're bigger. And if the past they tended to be slimmer relative to their height, that's no longer true for male Americans: http://ajcn.nutrition.org/content/87/2/445.full

So taller people would still pay more than shorter, on average.

Yes, but not me. Hence the last sentence of my 'suggestion'.

Sure, cost is a function of weight, but revenue is a function of number of passengers, so giving you extra space means reducing revenue overall.

> How about they charge heavier people more - that's usually not genetics, so seem mor fair.

Someone's gender is genetic and men would pay more under your scheme as would taller people.