Fun fact the 707 had the first implementation of “MCAS” because the plane had a tendency to pitch up in a certain flaps configuration. They added a stick nudger which applied light pressure in said config. Not a stick pusher, as it did not alert the pilots, it simply applied an extra input independent of the pilots. However this was made aware to all pilots of the plane and likely contributed to its certification.

Also the 707 tail was extended by 40ft to give it better minimum ground speed control, this was retroactively applied to already built planes. Very interesting to see how this was applied in the past with a lawyer at the helm vs the current ceo during the launch of the 737Max