Originally Posted by
jrl767
I think it actually goes back farther than that ... iirc the 767 concept was designated 7E7 and the 757 was 7N7 (for reference, I joined Boeing Commercial in 1978, transferred to Flight Test about six months later; was Test Director on the #4 767-200 and several other early production jets Dec 1981 to Sep 1982)
Slight error:
767 - 7X7
757 - 7N7
unbuilt MD-80 lookalike with propfan (rearward propellers) - 7J7
787 - 7E7
My guess is the plane after the 797 will be the 7A7 followed by the 7B7. That would mean about 20 models because I and O would probably be skipped.
I don't think it will be the 7107, 7117, 7127.
I don't think it will be the 2707, 2717, 2727.
I don't think it will be the 7710, 7720, 7730. (77-something)
I don't think it will be the 710, 720, 730 or the 710, 711, 712