@Jwenting, when you say:
"Yes, 737-600, -700, -800, -900.
757-200, -300, 767-200, -300.
737-300, -400, -500
And now 7E7-100, -200, -300.
Guess what, Boeing's been doing that for decades... It's called an aircraft family and other manufacturers have successfully copied the idea."
I agree with you on that, but guess what, Airbus not only copied the idea, but improved it.....
Also, I agree with CX
_flyboy, that it's a bit a sour grape strategy that Boeing goes. What makes them so sure to "kick Airbus's butt"? The plane isn't flying yet, not to think about reached the performance targets that they set. Also, I remember that they said once that the engines are accountable for the largest share in efficency inprovement....... Who thinks that AI
can't adapt those engines to their planes as well and have a benefit?
Last but not least, I really hope that Boeing succeeds to build those family, as competition always stimulates the business!