ruveyn wrote:
Sounds reasonable. More fuel is required to lift their weight than that of a lighter person.
ruveyn
But it does not require more crew (salaries, wages and benefits are the highest cost in travel), more spares or more maintenance. It does not increase the cost of landing fees and ground handling. Let's not forget the add-ons. It does not require extra security screening, passenger facility cost, customs and agriculture screening (for international travel).
The commodity model of pricing--suggesting that every seat is a single commodity for which a consumer should pay a fixed price--has not existed in airfare pricing for decades.
Rather, air transportation is a service which has a finite capacity. The cost of the service is based not on the cost of delivering that service (it is cheaper to fly from Chicago to L.A. than it is to fly from Chicago to Reno, even though the distance to LA is greater, and the cost of operations at LAX are more expensive than those at RNO). The cost is based on the supply of seats and the demand for those seats. It is not unheard of for airlines to offer seats on a below-cost basis in circumstances of competition, and to move to excessive fares in circumstances of monopoly.
In that situation, the passenger is merely one more demand for the exact same service as the next passenger seeking to travel between those same two points, not a passenger consuming double the commodity.
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--James