Originally Posted by
JayMatlock
You would need to save 40k$ (which is the cost of the flight hour of the cargo airplane) worth of fuel for it to be worth the trouble. Not taking into account the development of a civil air to air system from design to crew training.
A quick fuel and crew change stop, keeping the passengers onboard, would be a much more economical option. This would probably add 1 - 1.5 hours to the trip.