Saw this news today and then also booked my flights to Sydney during the holiday period.
https://newsroom.airasia.com/news/airasia-x-adds-three-new-k…
It is the cheapest ones during the end of the year holiday to Aussie compared to other airlines. For instance, return flight from AKL - SYD, leave on 24th Dec and return on 8th Jan only $418. You would get the same price if you are departing AKL on 20, 21,21,24,26 Dec, returning around 8th Jan
If you sign up with them the fare will be even few dollars cheaper down to $415
Great deal considering prices on other airlines at the moment!!