Originally Posted by number_6

Note the comments earlier in the thread that the AS F bookings are sold as discounted F fares, and not as YUP or instant upgrade AA Y fare ... so be sure you are buying what you expect. AA does sell some instant upgrade fares that book into F on AA and Y on AS, and those particular fares don't earn the large SCs on QFF on the AS sectors, so be sure you understand what fare basis you are booking. It varies by route, date and maybe even by fare availability, and unfortunately aa.com is a bit cumbersome for checking the fare basis, but if you want to be sure of getting the SCs, then better do this check before you buy!