One thing that isn’t unionized in the European Union is regulation of aviation. All of the member nations belong to the ICAO and there is an EU agency (EASA) that does most of the same stuff as our FAA. However, there is yet another layer of regulation on a per-country basis. “They can’t be less restrictive than ICAO, but they can add restrictions,” said a local pilot. “Every time a plane takes off, the Irish Aviation Authority considers that it has failed.”
It sounds reasonable for a country to have its own FAA-style agency. But Ireland’s population is 4.7 million. Should Metro Atlanta or South Carolina have its own FAA? Estonia, with a population of 1.3 million, also has its own aviation regulatory authority (can there be more than a handful of airplanes based in Estonia?).