Travellers arrive at the international terminal at Sydney Airport, as countries react to the new Omicron variant of the coronavirus, in Sydney, Australia, November 29, 2021. AAP Image/James Gourley via REUTERS

Travellers wearing protective suits are seen at the Soekarno Hatta International airport, as the country bans the arrival of travellers who have been in eight African countries to curb the spread of the new Omicron variant of the coronavirus, in Tangerang, near Jakarta, Indonesia, November 29, 2021.

Passengers wait for confirmation of flights outside the Swissport Ticket Sales counter as several airlines stopped flying out of South Africa, amidst the spread of the new SARS-CoV-2 variant Omicron, at O.R. Tambo International Airport in Johannesburg, South Africa, November 28, 2021. Image used for illustrative purpose.

A traveller wearing personal protective equipment arrives at the international terminal at Sydney Airport, as countries react to the new Omicron variant of the coronavirus, in Sydney, Australia, November 29, 2021. AAP Image/James Gourley via REUTERS

A passenger tries to find a flight as several airlines have stopped flying out of South Africa, amidst the spread of the new SARS-CoV-2 variant Omicron, at O.R. Tambo International Airport in Johannesburg, South Africa, November 28, 2021.

Foreign tourists arrive at the Bangkok's International Suvarnabhumi Airport as Thailand bans entry from 8 African countries due to the new Omicron variant of the coronavirus, Bangkok, Thailand, November 29. 2021.

Passengers queue at the Kenya Airways ticket sales counter to book flights as several airlines have stopped flying out of South Africa, amidst the spread of the new SARS-CoV-2 variant Omicron, at O.R. Tambo International Airport in Johannesburg, South Africa, November 28, 2021.

Foreign tourists wait for their flight at the Bangkok's International Suvarnabhumi Airport as Thailand bans entry from 8 African countries due to the new Omicron variant of the coronavirus, Bangkok, Thailand, November 29. 2021.

Passengers wait to board international flights, amidst the spread of the new SARS-CoV-2 variant Omicron, at O.R. Tambo International Airport in Johannesburg, South Africa, November 28, 2021.

People wait in front of an "Appointment Desk" for quarantine and coronavirus disease (COVID-19) test appointments inside Schiphol Airport, after Dutch health authorities said that 61 people who arrived in Amsterdam on flights from South Africa tested positive for COVID-19, in Amsterdam, Netherlands, November 27, 2021. Image used for illustrative purpose.

Travellers wait for documents checking, at the arrival terminal of Soekarno Hatta International airport, as the country bans the arrival of travellers who have been in eight African countries to curb the spread of the new Omicron variant of the coronavirus, in Tangerang, near Jakarta, Indonesia, November 29, 2021.

International check-in counters stand empty as several airlines stopped flying out of South Africa, amidst the spread of the new SARS-CoV-2 variant Omicron, at O.R. Tambo International Airport in Johannesburg, South Africa, November 28, 2021.

Passengers wait to board flights, amidst the spread of the new SARS-CoV-2 variant, at O.R. Tambo International Airport in Johannesburg, South Africa, November 27, 2021.