Originally Posted by CX500T

Probably what would be the largest problem in a 757 NEO would be the 757 is basically the only airframe in that thrust class. So lets just envision a scaled up PW11/15000G (GTF on Neo/220) but now you can ONLY put it on a 757.

Granted the 1100G only fits the 320/321 NEO, (too big for 737Max) but the pool of available airframes is larger to spread the R&D Cost out over. The only other common airframe using that thrust class is the C-17.

75s biggest problem is that there is nothing else in it's class. It's the biggest, longest range, heaviest narrowbody out there. Period.. It's basicaly a widebody and a half, but with widebody systems, brakes, etc.

But the engines for it would fit the 757 and C-17. That's it. Market is not big enough to support that R&D Budget and have a ROI anywhere near where the company wants to see.