This is true for the one/two class flights where there's Y or F&Y but not for the 3 class F,J&Y transcontinental flights....
Also note that unlike a J Circle Pac where any US domestic flights book into First, the QFF oneworld classic award in Business will book into Economy.
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HKG-LAX is operated by CX so for an award booking you will need to book the CX flight number and NOT the AA codeshare flight number. Except for a very specific exceptions, QFF awards must be booked under the flight number of the operating airline and not using a codeshare flight number.Note you would have to use CX for SYD-HKG and AA for HKG-LAX or add in a few other flights to ensure you used 2 other oneworld airlines.