Prime Minister Scott Morrison has also announced a further 60 Australians and visa holders have been rescued from Kabul and, in a phone call overnight, he thanked his British counterpart Boris Johnson for the Royal Air Force assistance in airlifting a group of 76 Australian citizens and Afghans with visas a day earlier.

The Prime Minister says 162 people have been rescued under the Australian mission and, subject to weather, flight slots available and the situation at Kabul airport, further flights are planned.

"So it is a very quick operation. Gotta move very, very fast and the situation on the ground is difficult," Mr Morrison told reporters on Friday.

"We will continue to work with other nations, other partners, in ensuring the airlift of Australians, Afghan nationals who we are seeking to support and indeed other foreign officials who are seeking to be evacuated out of Kabul."

Three flights to rescue Australians and visa holders have now been performed in dangerous and chaotic conditions, two by RAAF aircraft and one by the British RAF.

People attempting to escape the Taliban are experiencing great difficulties getting to the airport, particularly getting through Taliban checkpoints.

Mr Morrison says Australian military escorts for people trying to leave Kabul have been considered but, under Defence advice, it is "not a matter that is considered viable".

"The situation in Kabul does remain chaotic," he said. "We are engaged in constant messaging and contacts, wherever we possibility can with those we are seeking to evacuate."

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"Operations of Australian Defence Force [personnel] or others who are there beyond the airport are not possible. They are not able to be undertaken in any way by the Australian Defence forces. To do so would put them at great risk with no commensurate benefit."

Mr Morrison says Australian military escorts for people trying to leave Kabul is "not a matter that is considered viable".

United States and UK forces are providing security at the airport. The Prime Minister says large numbers of people seeking Australian assistance are starting to arrive in Kabul.

He stressed it was a difficult and dangerous mission.

"We're dealing with the Taliban, so I'm not making any assumptions and I'm moving as quickly and as safely as we possibly can to get as many people out as fast as we can," Mr Morrison said.

Those who arrived in Perth overnight have entered quarantine.

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