Wouldn't that depend on your citizenship?

From what I understand, the trans-tasman "domestic" flight would apply on to citizens and permanent residents(regardless of citizenship) of Australia & New Zealand. In any case, those group of people do not require a visa to travel between those countries.

I still think the flights would arrive and depart from the international terminals and the ANZ citizens/Permanent Residents would've been pre-cleared before boarding the aircraft and be exempt from inbound immigration control (having already cleared that while checking-in / pre-boarding.