ZK-NEZ
Interesting becos its an old - really old! - Dash 8-100 that belongs to Air National. Tat was once Ansett NZ's that the ft Ozzie managed to coozer under the Air NZ banner.
Okay maybe not so interesting...
As for ZK-NG* Air NZ might be keeping them/re-using them, for the oft rumoured -granted cew-rooms - Boing NG's that may be coming. Seeing as we got lumbered with the Bus's becos of the aforementioned Ozzie.
If we were commited the Froggie prouduct, why wouldn't we have bought some bigger ones and not gone back to Boing?
Also don't Bombardier + Boeing have big $$ tie-ups in US with defence etc.