Originally Posted by UA Fan
Thanks for the detailed reply. I assume that this is not an industry wide standard. So if a QF FF flies on an AA codeshare on a BA flight would he/she earn miles per AA rules? Also any idea if UA follows the same ? Thanks.
No, by QFF rules for an AA flight (presuming by QF FF you mean crediting that flight to the QF FF plan). Making the codeshare as if it were an AA plane, and not BA. So if that fare class earns 100% on AA and 25% on BA, the flight would earn 4x as much if booking the AA codeshare than the BA flight number ... despite being on the same flight.
Every airline that I have seen has this same rule, but some limit how status miles are accrued on codeshares, or require the base metal for the codeshare to belong to a certain set of airlines. Rules are different for each plan. UA is similar but I don't know the nuances, I avoid UA like the plague for various reasons, one of the few airlines that I find unacceptable and use only in emergencies.