When AB in O/W, you could redeem your AB miles for an AA flight.
I had a similar problem even involving different routes and class (eco

)
- In a case, we got ZERO, NULL...
- In the other we got something that in future (1 or 2 yr) can be used for a free flight.
- In the middle we got something but not able to use it... but better than having nothing at all IMO