You can’t just “fix” the union situations because of how the labor relations act (and other legislation at different levels) limits the speech and actions of corporations. A union basically creates a monopoly around labor within the company, and that monopoly creates rules that result in benefits for members at the expense of the company. And overcoming that is hard unless you resort to things like outsourcing, which happened to significant portions of the Dreamliner despite how awkward it was. The ideal fix would be to have competitive in house labor without these restrictions.
Also I don’t think executive pay has any relation to what I am alleging, which is that part of the blame lies on old boys clubs and unions. Executive pay is determined by its own market of supply and demand. Sure they get some of the blame but there are limits to what is possible even for the best of executives. Also consider that the sum of executive pay is a lot less than the sum of the assembly line pay, so even by your own logic the responsibility cannot be solely at the top.
That said I totally agree that Boeing executives have largely failed, and the choices made by the board in appointing finance people or old guard from other aerospace companies is a big part of the problem.