Once upon a time you had two pilots, an engineer, a navigator and a radio operator. Gradually the numbers came down.
I can see how the 747 went from 3 to 2 - all the gauges moved into glass displays but what caused the step between the Trident, 727 (I'm assuming that's 3 crew?) etc and the 2-pilot 737, DC9 etc? How was the third man removed?
