Martin Hotze wrote:

I'd say that there must be a price at which it is cheaper to let the passenger
stay behind than carrying him along. (weight -- fuel, eating, drinking,
cleaning costs).

On a typical domestic U.S. flight, it's negligible. There's almost no additional fuel
cost to carrying the extra 200 pounds or so, the food is a bag of peanuts and half a
coke (total cost about $1), and the cleaning staff have to spend a few hours on that
plane whether you fly or not.

George Patterson
In Idaho, tossing a rattlesnake into a crowded room is felony assault.
In Tennessee, it's evangelism.