I worked at a couple of the Boeing plants in the 90's - early 00's and some of the observed work pracrtices on the shop floor were surprising compared to other manufacturers i've worked for. e.g. a hammer to make something fit, or redrilling rivet holes if they didnt line up.
But there did appear to be robust inspection to catch the worst things, and a general culture of quality higher up.
I'm not sure those positives have fared well in the last 20 years.