If you've gone to the US (and particularly if you are a US citizen) don't worry about it. I have it on good authority that the last thing CX want's to do is find themselves in a US court discussing labour law and contracts. Needless to say, a good lawyer would have a field day with CX and tear them to shreds. Get on with your life and thank God you are no longer working for the most messed up airline in the modern world.