An IT outage affecting check-in counters left Jetstar passengers facing long delays at airports across Australia on Tuesday.
Twitter user Kate Holdsworth wrote: "Computers are down everywhere in Auckland Airport".
Nicola Hogg, general manager for Border and Visa operations at Immigration New Zealand said the delays were caused by a failure of an IT system run by France-based SITA.
Passengers are being warned to expect delays after Jetstar's check-in systems went down - days before the airline's workers are due to strike.
"In the meantime INZ is using manual back-up systems, which could cause some delays to passengers checking in for flights to New Zealand from overseas and when they arrive in New Zealand".
A Melbourne Airport spokesperson has told 1 NEWS they are also experiencing the same issue and they believe it to be a "world-wide customs technical issue".
"We know delays are frustrating and we're really sorry for the impact to customer journeys".
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And in Sydney, passengers heading to Sydney Airport have been warned to expect significant delays, with reports the global passenger check-ins are now down.
Border Force also is reporting "issues with global outbound processing", Brisbane Airport said.
"Our airport systems are progressively coming back online and we are working to resume normal operations as soon as possible", it said.
Baggage handlers and ground crew will walk off the job over their work hours and wages after the company "rejected basic demands".
Later this week more than 250 Jetstar employees will strike during busy periods.
"They are finding it harder and harder to support their families and Jetstar won't listen when these workers repeatedly say their jobs are not safe because there are too few workers lugging around thousands and thousands of kilos of baggage and having to service overlapping aircraft".