<font face="Verdana, Arial, Helvetica, sans-serif" size="2">Originally posted by NM:
I don't believe any OW airline allows upgrades using another airline's FF points/miles. So as an AA FF member you may be able to upgrade the AA sectors, but not the other airlines. Not sure on the restrictions on code shares (ie using the AA codeshare of the QF flights over the Pacific). QF points can only be used for upgdeas on QF flight numbers on QF metal. I assume/expect other airlines work the same.</font>
You can't upgrade codeshares.
There's an AA-CX exception where you can upgrade a full-fare Y or J ticket with AA miles.