Updated 7.55pm:Â Airways New Zealand says the issue which saw flights suspended nationwide has now been identified.
NZME. reporter John Weekes is at Wellington Airport.
He's been speaking to one woman who was supposed to fly to Napier this afternoon - but her flight's now been delayed until 11:30 tomorrow morning - so she's looking for alternatives.
"Buses, rental cars, trains, and they're even calling around friends of friends to see if they're able to get a lift instead of staying in Wellington."
An internal network failure happened at around 2.40 this afternoon.
Airways says it immediately suspended all flights while it investigated the issue and until it could be satisfied that it could operate safely.
It says it has now thoroughly tested the integrity of the system.
Airways says at no point was the safety of any airport operations compromised.
Around 50 flights in the air were affected by a radar fault this afternoon which grounded all flights.
Limited operations started up again at four o'clock and full service resumed at 4.30
A spokeswoman said they are currently working on the issue and will have an update once they have detected the cause.
It's understood backup systems are being used to get planes back in the skies.
It's still not certain what caused the fault, but backup systems are being used to stop any further travel delays.
International flights are being given priority.
That will be followed by domestic and then regional.Â
Planes which are currently in the air are able to land.
Labour MPs are tweeting that flights seem to be gearing up to get off the ground.
Jacinda Arden says Air New Zealand is now boarding flights from Auckland to Dunedin.
She says either the radar has been fixed, or they're just 'giving it a go'.
Meanwhile David Cunliffe tweeted 'Air traffic control back up and flights boarding. Whew'.
Â
Air traffic control back up and flights boarding. Whew pic.twitter.com/Agtwc6YVCl
— David Cunliffe (@DavidCunliffeMP) June 23, 2015
At 2.48pm today 23/6/15 we experienced a radar failure. We are working on the issue, and will provide an update.
— Airways New Zealand (@AirwaysNZ) June 23, 2015
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