According to most FFP rules I have read, it is the operating carrier that matters, and the booking class of the operating carrier that matters. However, where does one look for the booking class counterpart? I have an OZ-issued flight that is operated by TK, booking class is W. What TK booking class is that? Cannot find it anywhere in my e-ticket. I am trying to see if it earns any miles with Asiana Club, if not I will try to check Miles&Smiles.