Originally Posted by
Astromiles
I may be booked (by someone else) on a full Y fare on a TATL flight with a BA flight number but operated by AA. Can I still upgrade Y>J using AA miles? Apologies for the n00b question.
It depends on who originally issued the ticket. AA or BA.
https://www.aa.com/i18n/utility/jba-...servations.jsp
Call AA and see if they can "touch" the ticket. If so, explore your options at that point.