"Safety is always our number priority, as our teams on the ground are working extra hard to get our customers to their destinations.

"We once again apologise to our customers affected by the disruptions."

Internationally, the Auckland Airport website shows a Virgin Airlines connecting flight from Sydney has been delayed, as was as a Qantas flight from Sydney and an Air New Zealand flight from Sydney.

An Auckland Airport spokesperson was not aware of any major issues and said Christmas Eve was one of their busiest days of the year.

There was an issue with an x-ray machine about midday today but the backlog of travellers was cleared by about 2pm.

An Air New Zealand flight from Adelaide had been rescheduled, as had a flight from Incheon in Korea.

An Air NZ spokeswoman said the Adelaide flight was late leaving New Zealand, so it was now running late coming back across the Ditch.There were no other major delays or disruptions for their network.=