This is all a load of bollocks, there is no reason why you should recruit a 'jet' guy over a 'turboprop' guy. They are both capable of being trained, the turboprop guy should probably get preference since they have 'company time' and there should be some reward for being in the system. However, from Air NZ's point of view when there is a big short term demand for recruitment and slotting in external candidates create less disruption and training demand then they will do that. Never believe any assurances from management.