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Combo photo shows Qantas air planes at the boarding area of Sydney Airport on March 18, 2020 (up) and the almost empty area at the airport on April 15, 2020, in Sydney, Australia. Australia's national airline Qantas on May 5 extended international flight cancellations till the end of July, but said that it was in a strong position to endure disruptions caused by COVID-19. (Xinhua/Bai Xuefei)