Keep in mind that QF's SYD-HNL flight is a two-class service. If your doing an AONE ticket, you'll not be in first on this flight. In my mind, buying an AONE ticket and not flying in F (CX F to be precise) on my transpac flight would be sacreligious, but, then again, I don't have much interest in Hawaii. You might want to price a west coast of the U.S.-HNL ticket or skip HNL all together so you can fly F on the transpac flight.