This is my case, hope it helps;
I hold PPL with Inst. privileges in the US, but also have an ICAO Mexican Comm, Multi, Radio Op, 727FE, etc, licenses/ratings. A few days ago I called an US FSDO and asked them about validating them in a US commercial. Unfortunately that is not allowed anymore (before 1997 it was) and is now mandatory to pass the written and the checkride. What they offered me was giving me a private and instrument (which I already earned the hard way -written, oral, checkrides-).
I still have a question though....
How come many Mexican-operated airplanes with US registry are flown by pilots that didn't even get a PPL in the US? Another example, Allegro Airlines, the company I used to work for, once leased a couple of Canadian 727's and I'm sure none of the crews held a Canadian license. Do the airline gets some special permit for their pilots or what?
There are no stupid questions... just stupid people!