The retirement of Air New Zealand's B767-300ER fleet was already announced August last year, see also:
http://www.aviationwa.org.au/2016/08/23 ... arch-2017/
Yesterday I noticed a single B767-300ER at Auckland Airport, on the Air NZ Engineering Services platform, with all its Air NZ markings stripped and it's ZK registration replaced with an US N-registration. Unfortunately I was unable to stop while driving to get notes or photos.