I hate to jump into these Wavoid disputations, but you miss KHILLO's point, almost completely, in fact. He speaks of the DC-3 being recognizable as the first airplane to be like a modern airplane in form and function. The operative words are: "in form and function", yet you you respond by reciting a lot of characteristics of contemporary aircraft that comprise not form and function, but what engineers and designers might call, 'implementation details', or things that are not intrinsic to the essential form and function of the object or machine in question. You are the exponent of the logical fallacy, not khillo. It's as if I would say that Archeoptyrex was the first animal recognizable to modern observers as comparable in form and function to a modern bird. That would be a completely accurate, non-fallacious assertion, despite the considerable differences in the non-essential details in the two creatures.