Originally Posted by
swag
so $42/pax/1K miles.
Not even close.
$42/passenger in a 137 seat SWA 737, for example, would be $5754 in jet fuel. At your $2.10/gal figure that's 2740 gallons or 18,358 pounds. That's enough fuel to fly a 737 for over 3½ hours including flying the weight of the airplane, bags, cargo, etc.