A computer problem led to planes being grounded across the country today.
The problem resulted in air traffic control radar in New Zealand being switched off for about 10 minutes, Airways Corporation said.
Corporation main trunk business manager Lew Jenkins said it decided to ground all planes that were getting ready to depart so it could shut down the system and engage a back-up system.
The switchdown meant there was no radar working for five to 10 minutes.
About 100 commercial flights were in the air at the time of the switchdown but there was never any danger.
Mr Jenkins said the last time similar computer problems occurred was "years ago".
