Transatlantic
As far as I am aware there are no plans to get rid of the 757 fleet any time soon, I believe they are planned in the program for at least another 5 years, probably only the newer frames. I cannot see the 737-800 doing any transatlantic operations in the near future. If anything with the fleet replacement debate the 757s will continue until a replacement is ordered, even when ordered will probably take another 3 + years before deliverys begin.