She said the worker had cleaned planes from high-risk countries.
- AFP Travellers proceed to the check-in counters for New Zealand flights at Sydney International Airport on April 19, as Australia and New Zealand opened a trans-Tasman quarantine-free travel bubble. "So happy'", she said.
To mark the occasion, Wellington International Airport painted an enormous welcome sign near its main runway and Air New Zealand ordered 24,000 bottles of sparkling wine, offering a complimentary glass to adult passengers.
Ms Ardern, speaking after the New Zealand Ministry of Health confirmed authorities were following the usual process of isolating the case, interviewing them and tracing their contact movements was underway, revealed she had not yet spoken to Australian Prime Minister Scott Morrison.
A woman hugs her daughter and grand-daughter at Sydney International Airport Credit Jenny Evans /Getty Images AsiaPac
Qantas will join Jetstar and Air New Zealand in connecting the Gold Coast to Auckland from today.
"You have to remember the vaccine is 95 per cent effective at reducing symptomatic onset of Covid-19 so it's still possible to get Covid-19 but you are not likely to get as sick, this worker is not very unwell so it's doing its job", Ardern said at a media stand-up this afternoon.
The travelers are required to complete a health declaration ahead of departure and return a negative test in the 14-day period.
Under the terms of the trans-Tasman bubble agreement, all states, territories and New Zealand can suspend quarantine-free travel with places that have outbreaks.More news: NASA's Mars helicopter becomes the first aircraft to fly on another planet
The airline's chief operating officer Carrie Hurihanganui said the carrier had previously been running just two or three flights a day between the two countries but that jumped to 30 flights on Monday carrying 5,200 passengers.
At the Auckland airport, a choir was singing Dave Dobbyn's "Welcome Home" as people hugged and kissed their dear ones.
More than half a million New Zealand-born people live in Australia, just over 2% of Australia's population of near 26 million.
Tourism operators urged governments on both sides of the Tasman Sea to ensure that the bubble stays open, which would help bolster consumer confidence in booking travel.More news: Three dead in 'active attack' shooting incident in northwest Austin, medics say
There are no other new cases in managed isolation or in the community announced today.
There was also one historical case of Covid-19 to report since yesterday - a recent returnee who had recovered.More news: Navalny Could Be Down to a Few Days, Doctors Say