Originally Posted by
aaupgrade
This is a question for which I would also be interested in the answer. FWIW if you had not figured it out already, AA gets a larger piece of the pie by booking the AA codeshares.
There is not a whole lot of benefit to booking AA codeshare over QF if you are in a premium class, however, the benefit to booking AA codeshare over JL is that you do not receive the elite status bonus on JAL if you collect miles in AAdvantage and have status.