If it must be EU to US agreement, not individual countries that may make it reasonable to actually negotiate some real market access in the US. You didn't seriously think ther ewas going to be significant access into the US market for european carriers without comprable access into a (barely) comprable market. MAybe start with europe to U.S. east of mississippi----that might be comprable.
With authority to negotiate agreements like this going to the EU from the formerly soverign states and the authority for airworthiness certification going to a european agency what other authorities of soverign nations are the european states going to give up next? Maybe when it comes to voting in international aviation fora EU should get one vote, individual states should get the same vote as individual US states, i.e. France = Ohio?