Thks for your comments.
My point tends towards the 2 crew aspect. If an aircraft is operated multi-crew (as per ops man) or the aircraft is on a two crew charter, would the FAA non- rated pilot not be able to log this as co-pilot ? (I say this as a pilot with an FAA license told me he is able to !)
Whereas a non-rated JAR pilot is unable to ?
Thks