Just 60% of Air New Zealand's trans-Tasman flights took off within 15 minutes of their scheduled time last month.  

A report by the Ministry of Transport shows airline performance for April. 

78% of Jetstar's flights between Australia and New Zealand left on time, and 70% for Qantas.  

Aviation commentator Peter Clark told Ryan Bridge Air New Zealand's has a large fleet, which means more planes needing attention. 

He says aircrafts have to be turned around, serviced, and catered every flight. 

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