If a manufacturer produces a family of Jets such as the 737G, A318/319/320/321, 772/772ER/773, do they usually share the same wingspan/wingarea and engines?
I've heard in some of the other forums that HP will not purchase the A321 because it doesn't have the peformance necessary to operate in hot/high conditions at PHX and LAS. The reasoning I was given was that the A321 was simply a longer fuselage with the same wingspan and engine size of its smaller family jets. Is this true? Is this common? Does a larger variation of a jet suffer from lack of power and performance if they don't upgrade the engine size and wingspan? just curious?