Upvote:2
On time statistics at this time are useless because of ongoing staff shortages across the world so past performance is not at all indicative of the future in any way -- it can be significantly worse than a 12 month average or it can be much better than a three month average.
With that said, my rule of thumb for unprotected connections is to prepare for being on the next incoming flight. Or be prepared to buy another, last minute ticket to the destination. This usually means a hotel stay which is just fine by me because usually I am half zombie anyways by the time I deplane from a transoceanic flight and a hot shower and a bed is all I want.
Upvote:2
I've done this trip recently (less than 3 weeks ago). Short layover times are stressful. If you don't know how to make the transit through immigration + customs + etc shorter then is better to give you plenty of time. Rule of thumb:
Usually getting out of the International Airport takes less than 2 hours if you arrive in a 5am flight, and there's plenty of time to kill between checking in your bags and getting into the airplane, but is way less stressful than checking time every minute waiting for your bags to show up on the conveyor belt.
My main suggestion would be though, if you know you are using AirNZ for both trips, set your flights directly using their website and let them worry about layover times, you'll get bumped automatically to new flights if the first trip is delayed for whatever reason and you don't have to worry about research or historic data.
Upvote:4
6 hours should be plenty.
My personal threshold for self connection is 4 hours. Auckland is not an easy transfer: you need to wait for your bags to come out, clear immigration, customs and bio inspection and than transfer to the domestic terminal, so adding 2 hour seems justifiable.
Be very very aware that Air New Zealand is in a bit of a state right now, with loads of domestic flights being cancelled at the last minute due to staffing issues
This would be Air New Zealand's fault and so you will retain your 2nd ticket. They would just rebook you to a later flight.