At the same time, we had a good understanding about aerodynamics in the 1960s and were producing more or less optimized designs. There are some additional optimizations that we&#x27;ve figured out like sharklets, but overall the design is similar -- at least until we trusted composites enough to use them in aircraft.<p>Where we have seen a lot of innovation is in the engines -- fuel economy and noise regulations have pushed GE, RR and P&amp;W to up their game substantially.<p><a href="https:&#x2F;&#x2F;www.youtube.com&#x2F;watch?v=Or5YEhiT_d4&amp;feature=context-gfa" rel="nofollow">https:&#x2F;&#x2F;www.youtube.com&#x2F;watch?v=Or5YEhiT_d4&amp;feature=context-...</a>