This is easy with the new AA.com site. Apologies for the cross-post - I also responded in another thread:
1. Go to AA.com and select "Australia" from the worldwide sites drop-down near the top of the home page in the upper right hand corner (it's the one immediately to the right of "My Account").
2. Set up your flights
3. Enter your passenger details and AA or QFF number in appropriate fields
4. On the payments page enter your Australian credit card info
5. Submit
YOUR DONE.
Hard to imagine an easier process than that.
No calls to BNE, UK, India, or Mascot required. You can do this all online.
If you are not happy with the flight options this method use the US AA.com site to hold a booking and call to provide your credit card number. Not a problem in my experience.