We could go on and on about he levels of subsidy for various state industries and how they’re applied. Much of the US subsidy is skimmed off the benefits of DoD research programmes and their follow through into civilian applications.
Whether it’s bananas or Jaguars or Scotch Whiskey, Uncle Sam doesn’t like competition. But rather than bore you with my view, here is the view of the American Institution of Electrical and Electronic Engineers:
As we approach the centennial of the Wright Brothers' first flight, it is more important than ever that America renew its national commitment to leadership in aviation. In order to do so, we must ensure the strength and stability of the nation’s aviation infrastructure by formulating and committing to a national aviation research and technology policy that incorporates adequate federal funding for visionary long-term aviation research.
So now what’s the difference between Airbus and Boeing?