Originally Posted by mitchdew
I am trying to use miles from American Express memebership regards for this trip. Either through Aeroplan(for AZ) or through One pass(for Qantas). I just have to decide wich carrier to use.
Then I suggest your decision will be most greatly influenced by award class availability of the two airlines. Trans-Pacific awards in premium cabins are scarce. Take whichever one you can find availability somewhere near the dates you want to fly.