Comment by wpietri
And I'd add that airplanes are unusual in the degree to which declining quality is visible. Boeing is working in an area where badness signals are heavily amplified.
My guess is that what's going on with Boeing is not that they're a particularly bad apple. It's that standard American business practices have slowly crept in, displacing the previous culture, which had focused on safety and quality. So I'd say Boeing was an anomaly that has now become typical. The interesting question then becomes: what is the deviance that has become normalized so broadly?
The end of the cold war- and a true market due to systemic competition? It gave union leverage, it gave politician a metric "continued existence" and it gave companies something to be or not to be.
Also you are right about this being the norm: https://en.wikipedia.org/wiki/Gilded_Age
This is what a free market without systemic competition always boils down into.