In order to get around the required flag fuel reserves at destination, for the LAX-SYD run, my company would file the flight plan to SYD but actually dispatch the flight to BNE.
There was a "re-dispatch" point that flight control annotated on our "how-goes-it" paper work based on the forecast winds and expected fuel burn.
If, by one hour, prior to reaching that point, flight control had not sent us a re-dispatch authorization based on our projected fuel and weather at SYD, we were to notify ATC of our intention to divert to BNE. As I recall, the re-dispatch point was somewhere roughly between Nadi and New Caledonia.
FWIW, I believe this "re-dispatch" technique was contrived by PAN AM and the FAA went along with it. There were times when some of the PAN AM A300's were, literally, arriving at JFK from Europe on fumes. Or so I was told.
Last edited by wanabee777; 1st Dec 2015 at 12:06.