People are rushing to get out of NSW over fears tougher border restrictions could be imposed on the state ahead of Christmas.
Long queues have already formed at Sydney Airport, with hundreds making the decision to move their trips forward as new restrictions looking increasingly likely.
Multiple states and territories have already reimposed border restrictions for the northern beaches, with some even requiring all NSW residents to go into mandatory quarantine upon arrival.
Pictures from Nine's Today show crowds of people packing the airport as people desperately try to leave the state.
The northern beaches Covid-19 cluster has grown to 17, with the NSW Premier warning residents to prepare for more cases over the coming days.
Genomic testing has revealed the cluster is linked to an international strain of the virus but authorities are yet to find the source of the outbreak.
Queensland, Victoria, Tasmania, the ACT, Northern Territory and Western Australia have all announced new restrictions for people who have been in the northern beaches.
Anyone who has been in the northern beaches on or since December 11 and has since flown to Queensland is required to get tested and quarantine at home or accommodation for 14 days after the date they left the northern beaches.
If they arrive in Queensland after 1am on Saturday, they will be required to go into hotel quarantine at their own expense.
In Western Australia, anyone arriving from New South Wales from Friday onwards will have to quarantine for two weeks.
If they travelled to WA from NSW since December 11, they must get tested and then self-isolate until they get a negative result.
Tasmania has banned anyone who's been in the Northern Beaches area on or since December 11 from entering the state.
The Northern Territory has declared the Northern Beaches a virus hotspot.
"Anyone who has already arrived in the Northern Territory from Northern Beaches Council LGA on or after December 11 needs to arrange for a Covid-19 test and self-quarantine while awaiting the test results," the NT Government said.
Victoria has asked anyone who's been in the Northern Beaches area since December 11 to "stay at home and get tested tomorrow".
The northern beaches has now shut down all of its public spaces until at least Sunday.
More than 250,000 residents in the area have been told to stay home for the next three days, with questions arising over whether the northern beaches will be put into an Adelaide-style "circuit breaker" lockdown.
Northern Beaches Mayor Michael Regan said he'd "absolutely" be okay with the area being put into lockdown to stop cases spreading.
"We're blessed with where we are. We work hard to live here and we have 20-plus beaches, I think a lockdown over summer is not necessarily a bad thing," he told ABC News Breakfast.
"It is not great. It ruins people's plans for Christmas and travel and catching up with family.
"I'm as affected as anybody else, but it helps keep everything in check and the state in check and the nation in check as well, if it is the right thing to do, then we should do it and we will be guided by what NSW Health says, but I don't think we should ignore that request if it comes our way."
Premier Gladys Berejiklian said contact tracers were racing against the clock to get a handle on the cluster in time for Christmas.
She said the next 24 to 48 hours would be "critical" in containing the spread.