Diplo passport
Greetings,
If your chum holds a valid diplo passport, is listed on the holders list with the various governmental agencies, then he can proceed as per international protocols. This must be checked with his own government to ensure that he is listed and all the overseas legations hold him as such.
Also any time commercialing his status must be made known to the carrier and of course his passport shown. Requests for special handling at airports outside of his own nation must be made through the local embassy.
Sounds simple, but can cause "brainhurtz" even when a "Royal/Amiri" flights acft hits the deck.
Cheers Merlinxx