A key component was the move of corporate HQ and power base from Seattle to Chicago where the execs lived, wrestling it away from the engineers in Seattle. Later they moved their HQ again to Washington DC to be closer to lobbying!
What I find most sad about what Boeing has become is that it was so predictable. I worked as an outside contractor at various Boeing locations in Washington and Oregon installing, maintaining, and training on the operation of CNC milling machines in the mid '90s and early 2000s. I was there before and and in the early days of the merger with McDonnell Douglas. In those days the pervasive sentiment among the machinists, engineers, and managers, many of whom had spent two and three decades working for the company was that the merger was going to get people killed. Sadly, those predictions came true even if it took longer than some may have expected.
[0] https://www.penguinrandomhouse.com/books/646497/flying-blind...
Out-Sourced Profits: The Cornerstone of Successful Subcontracting by L. J. Hart-Smith, an engineer at Boeing's Phantom Works unit during that transition period, was a internal paper that walks through one of the many disputes between Boeing and Douglas/GE culture and derives why the Boeing way was correct.
