On FAA and radio licences - I own an N reg airplane which I fly on an FAA licence in Barbados (the trust is SAC from the UK - go figure!).
I was issued a radio licence for the airplane for when it left the US - it is no a personal radio operator licence but rather a licence for the airplane to be a "radio station" - it was not needed by the US authorities for use in the US but rather so as not to possibly break the laws of the islands I passed through flying the airplane down here.