I overlooked the question, 27/09.
100% AirNZ, given that there was nothing wrong with the aircraft.
As for apportioning blame between the various AirNZ employees:
AirNZ Flight Ops and Nav sections: 60%
Capt Collins: 30%
F/O Cassin: 8%
F/O Lucas: 2%
F/Es Brooks and Maloney: 0%