So last night found me at Willow Run again. I found out that there were going to be some Yankee Lady flights, so I had to catch one of them at least.
In 1952, DeHavilland entered the jet airliner market with their Comet. Initially it was success but it was grounded in 1953 and 1954 after several fatal crashes. The investigation determined the problem wasn't with the plane itself but metal fatigue caused by square windows. This information was fed into the design of the DC-8 (and 707).
In 1954, what would eventually become the 707 was launched. In 1957, what was the 707 was launched and that was the beginning of the end for propeller planes. The DC-8 had it's first flight in the next year and during its 14 year production run, 556 of them were built. There are still a handful in use as cargo planes.