I heard second hand that the MD managers who got promoted in Boeing after the merger decided to not build any new modules in house at Boeing. They were able put

I heard second hand that the MD managers who got promoted in Boeing after the merger decided to not build any new modules in house at Boeing. They were able put a lot of pressure on their new suppliers who were small compared to Boeing and made a lot of money. Over time many Boeing suppliers lowered their quality to stay in business and others failed outright. Since then there has been a lot of consolidation of the suppliers of Boeing, to the point where Boeing has much less leverage than it once did and often has only one option left for many of the parts in needs. I'm not sure how much this has contributed to its current issues, but it seems a systematic issue that Boeing doesn't make its own planes anymore and has to rely on suppliers who are scraping every ounce of margin out of their production processes.