If you are planning on taking multiple trips in a 12 month period, and can handle pre-paying for two tickets, you can save money over the long run by booking your first trip ex-AU but the others ex-USA.
For instance, if you plan on making two Business class trips to the US in a 12 month period using DCIR26 fares ex-AU, that'll cost you $22198 AUD plus taxes.
As an alternative you could book one DCIR26 ex-AU and the other ex-USA (ticketed on AA and paid in USD), with the flights overlapping ie:
AU-USA on DCIR #1
USA-AU on DCIR #2
AU-USA on DCIR #2
USA-AU on DCIR #1
Which comes to a rough total of $21562 ($11099 AUD for #1 + $11200 USD = $10463 AUD for #2). Not a huge saving, but if you do this over multiple trips it does add up, especially when our dollar is doing so well against the USD.
Of course the downside is that the first time you do this you need to pay for both trips up front.
Perhaps more usefully you can also use this method to work around some of the Circle Pacific fare rules, such as minimum stays and stopover requirements. An example is if you wanted to do a quick (1 night) trip to the US in First on a paid ticket - a straight return ticket comes to about $28,000 AUD using the Qantas site. Booking two ACIR22 fares (one ex-AU and one ex-USA) comes to about $24,000 AUD, and having the two fares allows you to work around the minimum stay / minimum stopover requirements as well as a significant cost saving over the direct fare.