Should the Lockheed R6V Constitution have stayed on the board?
Boeing revolutionized aviation with the Wide Body when power was available. Imagine if the R6V had Fan-jet type power. Without that power they built the Super Connie which was the most beautiful commercial aircraft ever but again, available power beat them, in the form of 707. What would be the state today if the R6V had the power it needed?
One might consider the XC-99 had it ever lost it's X. However given the problems of the B-36, which it evolved from it wasn't destined to have a viable future. Granted the XC-99 was huge but then so was the Spruce Goose. The R6V on the other hand was an evolution of aerodynamics built at a time we didn't have engines sufficient to punch that much of a hole in the atmosphere.
Amongst my squadron mates were two who were FE's on B-36's. It was best known for an adrenalin maker.