Despite being Boeing's 696th jumbo jet, it was the first upgraded 747-400 to be built. The -400 was a major step forward for the 747 as it not only increased range and performance but also ...

Today, with hindsight being 20/20, we know how the Boeing 747 revolutionized air travel. But that was anything but a sure thing back when it was still on the drawing board in the mid-1960s.