The thing that shocked me about this documentary about the 747 is the claim that they went from napkin sketch to working prototype in just 20 months. Twenty mon

The thing that shocked me about this documentary about the 747 is the claim that they went from napkin sketch to working prototype in just 20 months. Twenty months!!! The world is a different place now. https://www.amazon.com/747-Jumbo-Revolution-Christopher-Spencer/dp/B07L4Z1TSZ https://www.amazon.com/747-Jumbo-Revolution-Christopher-Spen...