Kindda a great idea looking back now, but let's look at the evolution of the commercial Boeing airplane.

1st the 707. Then the 727 and the invention of the slat (oh lala), then the 737 with only 2 engines. But then the 747-100 came into play with the 757 comming later. the 767 was developed in part as a smaller wide body and also to fly over all that nasty weather that the rest had to fly through. Now the 777 and the 717 (OK, I don't have an explanation for the 717).

Soon the new Boeing tripple decker, 787!!