If you have status with QF (oneWorld Ruby or higher), baggage feees would be waived on AA, due to the AA-QF alliance partnership. Fares are similar to those listed above for the other carriers.
You would also be able to credit your AA flight to your QF account(s) - the earnings base rate is 0.5 for discount economy, but still better than zero
http://www.qantas.com.au/fflyer/dyn/...ms#airlineearn
Additionally, your transfer from the Tom Bradley terminal (International Arrivals) to American's Terminal 4 would be the shortest possible of the various airlines, since Bradley Terminal and T4 are next to each other/
AA does not have hourly service, but they do have flights at approximately 09:30 and 12:30.