I never really fully understood the legality of things behind code sharing ., but if a pax buys a ticket with airline A, with a A flight number on it but the flight is operated by airline B in reality this is normally adverised when you buy the ticket. . If somethig goes wrong , it is airline B which is responsible as I understand it . So in this case Delta is not responsible if Virgin got a problem over Iraq, or did I miss something?