Originally Posted by Dani
... Are you aware that all Boeings from 707 to 737 have the same fuselage? ...
Well - not quite.
In fact the 367-80 would have been only 5-abreast seating; the C-135/KC-135 was a bit bigger; the production 707/720/727/VC-137 were bigger still; the 737 has a smaller lower lobe; and the 757 has a new nose of course. There is virtue in standardization, but not when the marketplace tells you it's time to change.
