We flew QF to SYD in October 2003. Flights were very full, but we were able to use our LAX/SYD coupon to go LAX/AKL/SYD. No additional fare required and the flight to New Zealand was empty. Don't forget about the non-rev desk at SYD. Forget about doing any duty free shopping at the airport. By the time you get your boarding pass, you will have precious time to get through passport control, security and then to the gate.

Have a wonderful time. Sydney and Cairns are beautiful. The Blue Mountains are spectacular, not to be missed.