I think your point is generally spot on, but I wanted to nitpick at this one:

> airlines needed it

No, they didn't. Regulation of fares, routes and market entry of new airlines kept prices artificially high until airlines were deregulated in the late 70s. Quoting from Wikipedia (https://en.wikipedia.org/wiki/Airline_Deregulation_Act#Effec...): "A 1996 Government Accountability Office report found that the average fare per passenger mile was about nine percent lower in 1994 than in 1979. Between 1976 and 1990 the paid fare had declined approximately thirty percent in inflation-adjusted terms. Passenger loads have risen, partly because airlines can now transfer larger aircraft to longer, busier routes and replace them with smaller ones on shorter, lower-traffic routes."