Originally Posted by
KoruPilot
I remember a show on Discovery with an ex Boeing engineer saying that there was a reason that Boeing did not go with the original 747 design, which looks very much like the 380; he said there was a reason they went with the bubble instead of the full upper deck. The understanding being the lack of belly space.
I heard they couldn't engineer exit slides that drop down from the upper emergency exits, onto the wing, and then off the wing. Seemed crazy to me, but I have heard it from numerous sources.