Per our SVP, winglets are not in the cards. Our airframes don't fly near the amount of hours a passengers carrier flys. The break even point for cost is way too high to make the retrofit worth it. He gave a specific number of hours the plane had to fly to make it worth it, but I don't remember exactly what that figure was. (Much higher than you would think, something like 15 hours of block a day). On top of that they are already looking to replace the older 757 airframes, and it wouldn't make sense to put winglets on a plane that will be going to the desert soon anyway.