Not for the fuel cost. The annoying factor is a different issue, but there are lots of other kinds of annoying and so those people should have to be charged too.
A 50-pound passenger plane weighs around 50,000 pounds including the passenger weight (according to google search). Let's pretend all 50 people are 200 pound men and the average ticket is $300. Being 350 pounds instead of 200 means you're adding 150 extra pounds to the plane, which is 0.3% of the weight of the plane. So if this 350 pound person is gonna pay for their fair share of the fuel, they would be paying $300.90 and the other 49 would be each be paying $299.98. Not really worth fretting about
. I suppose if you add the extra weight that their larger clothes weigh, their proper payment might be $301.00 instead. If you add a "wear and tear" fee for when the tires hit the runway and for the seat cushion, that might be another 3 cents. Just guessing on that one, though.