I am exchanging my old 757-200's for 737-800's. I have been doing some calculations first and I can see profit-wise it is ok to do this, although my 737-800's are not giving the profit I want them to give. I am doing this fleet-renewal mainly because there is no real successor for the 757-200. Even on the several Boeing-wiki sites I read Boeing never intended to build a next generation for the 757-200. When I try to plan the 737-800 on a route, starting from about 2200 NM , up to 3000 NM I mainly get the advice to use another aircraft for that distance, or at least there are pax-limitations. From what I read on the RL use of the 737-800 there are several companies using the 737-800 for flights between 2000 and 3000 NM. So why getting that negative advice on flights over 2200 NM
Now I start to wonder, is there a better option than the 737-800 as a successor for the 757-200, and that besides Airbus, but preferable within the Boeing family? Or?