Originally Posted by
DMPHL
If a cancellation happens in advance, and they are rebooking on a partner, then it's definitely a YMMV/HUCA situation. I've had agents rebook me in BA F (AA codeshare flight #) when my AA flight (upgraded to F with a SWU) was removed from the schedule. I've also had them tell me before that they couldn't.
In an IRROPS situation at the airport, the agents will usually just treat you like another business class customer, and have more leeway to endorse your ticket into J on a partner.
This. A schedule change/cancellation in advance and you can pretty much only ask for another AA flight. If it's IRROPS in the commonly understood sense (within 24 hours of departure/day of departure) then you're just another J passenger and should be rebooked as such.