Originally Posted by
entropy
... and they could've used a higher performance GTF on a 757as NMA..... They could almost certainly build a composite 757NG 200/300 + new gen engines that would get the job done.
757 uses about 45,000 lbs of thrust - way more than the GTF can product. It would have required a new engine from Pratt.
Unfortunately Boeing got rid of all the tooling long before anybody was thinking NMA. They also almost certainly would have had to design whole new wing, which is billions of dollars.