I hear what you're saying, but can you imagine that no one state should run the whole affair? Again, looking at the U.S., federal affairs are run by officials elected by constituents to sit in a federal parliament. State affairs are run by officials elected to sit in the different state parliaments. Each state is still completely sovereign, with its own laws, customs, flags, anthems, dialects, etc....but they have given up just a few rights to the federal government. I think this DIRECTLY relates to aviation, as we see in the U.S., it is the federal agency that regulates aviation, and in so doing, is able to move at a considerably quicker speed than it's European counterpart. In exchange for giving up the right to regulate its own airspace, each U.S. state enjoys the benefit of security, border control, traffic control, airline control, etc., provided by one central federalized authority.
Why couldn't such a system work in the E.U.?
I also understand the point about different cultures evolving for how many hundreds of years, but again, the U.S. has demonstrated that it is ENTIRELY possible to keep one's identity inside a federalized union. As mentioned before, each state is almost sovereign, with their own systems and laws. They regulate everything within their own borders, they could even establish their own official languages if they wanted to. I think this sort of system is a great compromise between federal powers and individual state powers. Why couldn't this also work in Europe?
Let me tell you, this is completely relevant to aviation. As a black American, I am TIRED, yes, read my lips, T-I-R-E-D, of being harassed at so called Schengen borders. It's so bad now, that I have to walk around with my passport, even inside the EU border. My opinion is, if Europeans would shift their view to a more unified vision, with a central authority, then once you get checked at the border, you'll never have to again worry while on the inside, and they can for one and for all do away with these stupid discriminatory laws requiring foreigners to carry a passport (how do you know I'm a foreigner by looking at me?). I know it exists in theory, but not in practice. Use your own imagination to figure out how this would be a boon for air travel as well.