Darwin is Australia's latest centre to be plunged into COVID-19 lockdown as the fallout from a positive miner case remains unknown.
The Northern Territory on Sunday reported four new diagnoses, with the government imposing a 48-hour lockdown for the capital city and some surrounding areas.
In NSW there are 30 more locally acquired coronavirus cases, all linked to the Bondi outbreak.
Health authorities are continuing to track hundreds of passengers from five Virgin flights on Friday and Saturday which carried people between Brisbane, Melbourne, Sydney and the Gold Coast.
The alert was raised after a Sydney-based flight attendant tested positive to COVID, and was possibly infectious on Friday and Saturday.
NSW Chief Health Officer Kerry Chant said the crew member did not have any symptoms when working those shifts and was unaware of having been a close contact of a worker at Sydney's Marrickville Great Ocean Foods, which has been identified as a transmission hotspot.
The Great Oceans Foods cluster has grown to 11.
"We have texted from the manifest people who have been on those flights, but in case they were text messages that did not get received, I am alerting everyone in the community to check the website and ask them to immediately isolate and get tested," she said on Sunday.
Millions of NSW residents are in the first day of a fortnight-long lockdown, and Premier Gladys Berejiklian praised the early behaviour.
"The anecdotal evidence we have today is that people have been compliant and we are deeply grateful for that," she said.
"I'm convinced if we pull together, we will start seeing the results we want to achieve over the next two weeks."
Resident of Greater Sydney, the Blue Mountains, the Central Coast and Wollongong must stay at home until at least July 9.
The NT situation was sparked by the positive case of a mine worker at the Newmont-owned Granites gold mine in the Tanami desert, some 540km northwest of Alice Springs.
More than 1600 people in three states have been ordered into isolation after he tested positive.
Chief Minister Michael Gunner said the worker was on a flight to Darwin with 80 other people. There are more than 200 other workers who flew from the mine to Darwin and authorities are still to contact with about 20 of them.
Queensland has reported two new local cases, with both people believed to have been active in Brisbane for several days.
An updated list of possible transmission sites has been released on the Queensland Heath website.
Western Australia reported one new COVID case and subsequently ramped up travel restrictions and density limits.
"We always consider going further," a government spokesman said.
Prime Minister Scott Morrison on Saturday remained confident about the nation's measures to combat the virus, despite ongoing questions about the speed of the federal government's vaccination scheme.
"Australia has been able to save lives and save livelihoods and suppress this virus more successfully than almost any other country in the world," he said.
"But that doesn't mean there's any absolute guarantee against this insidious virus."
Australia has ordered 40 million doses of the Pfizer vaccine, which would cover the entire adult population.
Amid fears the contagious Delta COVID variant could spread from Greater Sydney, New Zealand has paused a quarantine-free trans-Tasman bubble until at least Tuesday.
Most Australian states and territories have imposed travel restrictions and are telling residents not to travel to NSW.
© AAP 2021