A larger economy of scale has nothing to do with a subsidy. What are you talking about?
Military Non-recurring engineering costs are big business. Boeing gets to cover most of it's with military contracts and then use spinoffs for commercial aircraft.
American aircraft manufacturers engineer down from military resources in commercial manufacturing. EU aircraft firms engineer up for the smaller pie military work, out of their commercial resources.
For an example, do you think that EU space agencies can compete with the space shuttle? Nope!!!!!! The EU could never mission profile a space shuttle like America's. Do you think that without a military component to the developmental side of the space shuttle it would ever have been pulled off? Nope.........
I used to do work at the NADC(naval air development center) Ninety percent of the engineers there are not government employees. They are there supporting Boeing projects, Grumman, McDD, Aliant Tech, EGG Rotron, Inland Motors, etc....All doing development work paid for by the DOD, yet produce intellectual results and design work which is later benefiting their commercial side of the business. Yes that's commerce, but it's entirely captive commerce at the direction of the DOD.