I never quite understood why the EU allowed N reg. aircraft with American crews to operate internal European cargo flights. (Fedex and UPS).
I think that it's grossly unfair to EU and UK crews and airlines, but they get away with it as the flights originate and finish in the US and Uncle Sam has some right to operate that 'we' don't in the US. It should be EU/UK crews and regd aircraft for the euro sectors and just N-reg for the US-STN/CDG/CGN etc.