Yes, in simple pilot math, that makes great sense. $7.50 extra "fuel surcharge" should not be that bad.

The airlines argue, that yes, that is all we are adding on the fare. Where they are loosing money is that gas costs $3.22 a gallon now when passengers are actually flying the flights, but it was only $2.22 a gallon 6 months ago, when passengers bought their cheap, advance purchase tickets.

So the airline's argument is "So we have increased the fares $7.50 today," but in 6 months when passengers go to the airport to fly the flight, gas might be $4.22 a gallon when the flight takes off.

In my opinion, still not charging enough, but I'm just a simple pilot, who doesn't know anything. Instead of charging $15 a bag, I would simply say, the ticket costs xxx, but is subject to a fuel surcharge at time of travel. Then the day they actually travel, a $7.50, or $4.50, or $9.50 surcharge is tacked on. (Based on cost of Jet-A at time of departure.)