I had heard that the reason we aren't getting the winglets is because of the wingspan/footprint. We have limited space in MEM and the winglets would add an addtional 10-11 feet.
A 727 is what, around 108'? A 757 is 124' and a 757 with winglets is 135'.
I'm sure that decision was made last year when oil was around $50. With it near $150, I'm thinking we will see them shortly?