Yes GB, and quite often you can get a better fare on the same aeroplane on the AA side of the aeroplane. That is the case from premium classes back through the economy subsets.
The crazy thing is that with oncarriage beyond SFO/LAX American is usually cheaper unless we are using our premium agent nett fares. If you are heading for Central/South America, the AA codeshare works every time and on one ticket and commissionable all the way.
QF does not handle codeshare yield well as the owner of the metal or the parasite.
Best regards
EWL