Originally Posted by Smiley90

Specifically, the SPG Amex cards earn SPG points directly and all AMEX Membership Rewards cards earn points that can be transferred to SPG and then to *A partners. UA isn't the best option there though since the transfer rate is only 1:2, vs 1:1 for AC. (but it has other 1:1 *A partners too, e.g. KrisFlyer) Not sure if there's any *A partners that don't charge YQ on international AC flight awards though, sorry.