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So given that both the basic recipe for the 737 and A320 are pretty old by now, how much "better" could a new clean sheet narrowbody realistically be, given recent in aircraft design?

And how much better would it _need_ to be, in order for large 737 operators to be convinced to place their next order for the new 7007? (yes, like nVidia, I trust they'll just add a number and start over when they run out of numbers).





This comment talks about next-gen engines as the driver for new airframe designs: https://news.ycombinator.com/item?id=45431849

Those engines will be a major driver of whether “better” is achieved, in particular maintenance costs and fuel economy will need to move the needle.




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