Originally Posted by UA Fan
Are you sure about this? Does a codeshare always mean that the rules of the airline have the codeshare flight # and not the operating airline apply for mileage purposes? Is this only for AA or is industry wide? Sorry to ask keep getting conflicting replies and so link to a reliable source would be appreciated.
Yes, the whole point of a codeshare is that it becomes part of the rules of the selling airline. A codeshare really is like a virtual airplane. So for FF earning it is the rules of that airline (AA in this example). The operating airline is irrelevant for the FF plan. All codeshares work this way, but some airlines include special rules in their FF plans to cover codeshares (often to control how status miles are earned). In the case of Oneworld this has been unified, all OW FF plans will earn status on codeshares on flights operated by other OW airlines (subject to the fare rules). I've not seen any FF plans which don't credit fully for codeshare flights in terms of miles earned (it is only status that doesn't always accrue).
As for a link, it is in the rules of each and every FF plan. So you have to look each one up individually; but I know this is one of the rare areas where Oneworld has OneVoice.