I've always been surprised that no major airline has vertically integrated into owning their own plane manufacturer (e.g. United to acquire Boom as a company).
Isn't that because airline is a low margin business ? You'd need a ton of cash to own your plane manufacturer.
You may have hard time to sell planes to concurrent companies so you cannot scale like Boeing or Airbus.
You would be tied to this manufacturer for life and if you start to manufacture defective planes, you are on the highway to bankrupt and selling your plane manufacturer wouldn't even save you because nobody wants a defective airplane manufacturer.
Sounds like a lot of risks.
But those are just my thoughts, i'm far from being an expert.
Is there a regulatory reason preventing this?