I don't suppose anyone knows the price of the Y class RTW fares ex CAI? (I have a funny feeling that there is a fter's website with a comparison chart for all the RTW fares - but I can't seem to find it)
If the fare is cheap enough - one could just have a permanent nested ticket (the C class is cheap enough as it is, but if Y class is on par in terms of savings that would be even better).
I don't suppose SYD-AKL would count for the TG longhaul sector would it? At any rate it is only 200 odd more miles to do CAI-DXB-BKK-SYD vs CAI-SIN-SYD so it isnt that much of a problem.