A pipeline that supplies fuel to the airport was closed over the weekend after a leak was discovered on Thursday. It has caused dozens of flights in and out of the city to be delayed or cancelled.
Up to 80,000 litres of jet fuel - or about two tanker loads - spilled from the pipeline at Ruakaka, about 130km north of Auckland.
It was damaged by a digger operating on a farm.
Auckland Airport said 28 flights have been cancelled today, up from 14 yesterday.