Originally Posted by Thai-Kiwi

I have in a couple of cases where bookings are very heavy, paid for a FlexiRefund on the preferred flight just to cover that flight being completely sold and being unable to move my cheaper FlexiTime/Refund. If the target flight is fully sold, then just after midnight I cancel and release 1 seat, which I then acquire with the free change from the other Flexi. Of course, you have to allow AirNZ to hold up to $450-ish for a few days until the refund shows. But this has worked well over a couple of Christmas periods.