Originally Posted by
alex67500
Not necessarily, but a program which pushes you to go indirect is flawed, not broken. Rewarding LON-NYC-SFO double over a direct LON-SFO is not great for the environment. Maybe that's a place to start.
That is not 100% correct in all cases. The very long flights that require the plane to carry a lot of fuel start to pollute more then an itinerary with a stop. It also assumes that both planes release the same amount of pollution. If the indirect flight is not out of the way too much then pollution would be comparable or lower.