However what is the subject of this topic is American pilots, flying N-registered airplanes, with FAA licenses, paying both personal and corporate taxes in the States, doing an air service in EU.
Interesting tho that may be to you, there are not any N-registered airplanes, with FAA licenses, paying both personal and corporate taxes in the States, doing an air service in only one county in Europe.
There are no N registered airplanes flying point to point in France or point to point in the UK. They are possibly revenue flying between
different countries of the EU which is legal according to the treaties signed during the Chicago accords and Bermuda I and II. Your nations (at the time}were signatories on those treaties.
And I am sure that those N registered airplanes and their companies are charged an overflight fee and landing fee, not by the EU, but by the individual country that they fly over or land in. True?