A computer fault led to planes being grounded across the country on Friday, says Airways New Zealand.
The corporation decided to ground all planes that were getting ready to depart when it became clear a computer system was not accurately receiving flight information.
It says it stopped the flights so it could shut down the system and engage a back-up system.
The corporation says the fault was extremely rare and engineers are working on finding out the cause.
All flights were able to proceed after a delay of about 10 minutes.
Airways spokesperson Lewis Jenkins says there was never any question that controllers were seeing inaccurate information.