The Jetstream J32 is ZK-VAH and is registered to Vincent Aviation. I understand that this aircraft is used on charters for Eagle Airways when one of their Raythean B1900D's are not available... I'm sure that Vincent Aviation would be happy for you to charter it also :-) This aircraft was formerly ZK-ECN, and more recently, VH-OTH.
The Beech C90A, ZK-FDN, is registered to Garden City Helicopters, and is used as an air ambulance.
Lastly, the Boeing 737-8FE, ZK-PBM is registered to Virgin Australia Airlines (NZ). I imagine that it won't be long before the bright red paint scheme disappears, as the aircraft are gradually re-painted in the Virgin Australia scheme.