Grahame,
Some info if you're interested (though you may well know already). The main air routes running West-East from Hawaii to Mainland USA are all coded from A-F. The northern most route has waypoints all beginning with A and so on to the southern most route with waypoints starting with F.
Sometimes on the Australia-LAX runs you may pick up either the Echo or Foxtrot route for the last part of flight as it seems the QF107 has done.
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