You can search for them right on the Alaska Airlines website. Check the "use miles" box. It will show options on Qantas ( CNS to BNE, MEL, or SYD, then to LAX). If you specify start in SYD it will also show options on FIJI Airways. Qantas flights in J are very hard to get with Alaska miles as Qantas FF members get to book award seats 25 days earlier. I did see some availability in J for October when I looked 330 days out. Booking one way at a time is easier.