Conditions of Carriage here . "Rule 15.5" down the list to the bottom. The ongoing question is does DOT technically trump their own local conditions of carriage. It may do but it may also take the first test case to fall either way before this all gets tidied up. For now ANZ are sitting in the grey zone and relying on customers not to push this - for obvious implications.

https://www.airnewzealand.co.nz/conditions-of-carriage