So, for example, without the ICAO agreement Delta would need to pay the importation duty on a 767 once landed at that foreign country airport, pay to have the 767 flight crew pilot certificates validated in that country prior to the flight, and pay to have the 767 AWC validated or be required to pay to have the 767 type certificated in that country. All of which would add up to a regular hefty bill considering Delta flies to many different countries each day, with many different aircraft and crews, each requiring the same additional costs currently exempt under ICAO as a contracting State.
But I’m not sure what other costs you are referring to in your Post #17?
Interesting how that would work without the ICAO agreement and that those costs are due to duties imposed by the governments involved.
Yes, let's try and figure out what those total costs are including those which are not imposed by a tax or duty. You are no doubt much more knowledgeable about this than I am, but here is what I would think of from my very limited knowledge:
The government must pay someone to review such agreements periodically, attend meetings to ratify changes, etc.
The FAA or some other agency must pay people to ensure that the US regulations conform to the ICAO agreements.
The FAA enforcement division must pay inspectors to try and enforce the US regulations in order to ensure compliance with the ICAO agreements.
The commercial aircraft operators must pay people to ensure compliance with the US regulations corresponding to these ICAO agreements.
The parts suppliers must engage in manufacturing processes and inspections to ensure compliance with US and ICAO regulations.
I imagine there are others or that one could break each of these categories down into smaller more particularized items. But is there anything big I am missing there?