Beautiful! With the new engines and winglets, plus I imagine some other features/technologies that are standard on newer aircraft, what do you think the hypothetical ranges on these things would be? Would they have any notable advantages over anything on the RL market?
Well, calculations would be really rough since one would have to consider fuel capacity and airframe weights and aerodynamics, but a guesstimate might not be impossile to figure out.
Given the 16% fuel consuption advantage of the CFM-LEAP engines and the fact that this aircraft would be almost the size of a 757-300 (so i'm gonna start calculating range from its 6.295km figure) I'd say range would be at least 7.302km. Plus blended winglets could increase range by another 4%, and split winglets by another 1%, plus some more 0,5% through weight reduction and ther improvements, so this would possibly give up a figure of some 7.708km. A 450km or so advantage over the 757-200, of wich it would share the passenger capacity. Or 300km more than an A321neo.
Still, a real "game changer" would be this:
Using the same rough calculations (16% for CFM, 5% for split winglets and 0,5% for other tweaks) we obtain a range of 8.874km for the 757-MAX-2 and 7.705km for the 757-MAX-3.
If this data is even remotely believable they would made up an impressive pair of transcontinental and transatlantic narrowbodies.