My point was that the 74-800 is essentially a stretched 400, the vast majority of the airframe is the 27 year old platform, and a percentage of that is from the classic, which has over a 40 year pedigree now.
The 787 is new tech in many areas, and a deparature from previous Boeing build experience. I am not saying they have run the program perfectly, there have been issues, but that it must have been easier to push the 800 through certification, simply based on the experience gained on the 400.
and I guess this is shown in the speed of certification completion. I do not claim to know the technical ins and outs of the design and certification process, I just fly the end result, so this is merely an observation.
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