Ice has started melting on the Dunedin Airport runway, and passengers are preparing to board flights.
This morning's -4 degree temperatures have caused delays of more than two hours at the airport.
One flight from Christchurch returned as it was unable to land on the icy runway this morning.
The passengers booked on that flight are being accommodated on other planes where possible.
The airport terminal is full of patiently waiting passengers. No flights have taken off or landed due to ice on the runway.
Passengers have been allowed to check-in their luggage. The sun is now rising, but a frost is taking time to thaw.
Black ice causes headaches near Greymouth
Three separate incidents of cars sliding off the road because of black ice between Greymouth and Taylorville have been reported today.
Police are warning motorists in parts of Greymouth to take extra care and watch their speeds this morning.
The three incidents reportedly happened before 7.15am today. No-one has been injured, but the road is still very slippery.
Council vehicles are gritting the affected roads, but police are asking motorists to drive to the conditions.
For the latest weather for your region click here