A RAAF transport plane on Thursday lifted 76 Australian citizens and Afghans with protection visas out of the Afghan capital to a base in the United Arab Emirates.

The flight also dropped a further 40 Australian Defence Force personnel and provisions into Kabul to help with the rescue mission.

The latest evacuation adds to 26 people extracted from Kabul during the first flight.

A flight to Perth with the first group of Australians and Afghan visa-holders is expected to leave the UAE on Thursday evening AEST.

The West Australian government will put quarantine places aside for the arrivals in addition to weekly passenger caps.

Prime Minister Scott Morrison said there were only narrow windows to get people out.

"We are moving urgently, safely, because we are taking nothing for granted," he told reporters in Canberra on Thursday.

"The weather is closing in and that's going to present some challenges over the next few days, but equally the situation can always turn, and so we are moving as quickly as we can."

Taliban officials say 12 people have died from gunshots and stampedes at the airport since Sunday.

Foreign Minister Marise Payne said Australia was working to establish an airport staging area to help people granted access to travel to Australia.

The government has defended offering 3000 humanitarian places to Afghans fleeing the Taliban despite other nations pledging intakes more than six times that figure.

Immigration Minister Alex Hawke expects the initial commitment could rise to 5000 as the situation unfolds in Afghanistan.

"What we do is announce figures that we believe we're actually going to place and then we increase them," he told Sky News on Thursday.

The United Kingdom and Canada have promised to grant safe haven to 20,000 refugees looking to escape the new regime which swept to power after allied forces withdrew.

"There are other countries who've taken different approaches," Mr Hawke said.

"They've said 20,000 when they actually will take 5000 in the first year and the 20,000 is down the track."

The minister said Australia's annual humanitarian intake cap of 13,750 was among the most generous in the world.

World Vision is among groups calling on Australia to create an additional 20,000 humanitarian visas for people fleeing Afghanistan.

More than 300 organisations have signed an open letter saying the government has a moral duty to the Afghan people.

Senior opposition frontbencher Tony Burke said Labor first questioned the coalition's efforts in 2018 before ramping up calls in recent months.

"We have a national interest in sending a message to the world that if you help Australia, we won't abandon you," he told Sky.

Governor-General David Hurley, a former senior army officer, urged Australians who served in Afghanistan to be proud of their service.

"You did as your nation asked," he said.

"You served diligently in very difficult circumstances. Be confident and assured that your efforts are valued and respected here at home."

Australian Associated Press