Air China flight CA841 from Beijing lands at Vienna International Airport, Austria, on Aug. 8, 2020. The first direct passenger flight from Beijing to Vienna since the outbreak of the COVID-19 epidemic arrived in Vienna on Saturday. The route will be scheduled every Saturday, according to its operator Air China. (Xinhua/Guo Chen)

Passengers walk out of Air China flight CA841 from Beijing at Vienna International Airport, Austria, on Aug. 8, 2020. The first direct passenger flight from Beijing to Vienna since the outbreak of the COVID-19 epidemic arrived in Vienna on Saturday. The route will be scheduled every Saturday, according to its operator Air China. (Xinhua/Guo Chen)

Air China flight CA841 from Beijing lands at Vienna International Airport, Austria, on Aug. 8, 2020. The first direct passenger flight from Beijing to Vienna since the outbreak of the COVID-19 epidemic arrived in Vienna on Saturday. The route will be scheduled every Saturday, according to its operator Air China. (Xinhua/Guo Chen)

A passenger walks out of Air China flight CA841 from Beijing at Vienna International Airport, Austria, on Aug. 8, 2020. The first direct passenger flight from Beijing to Vienna since the outbreak of the COVID-19 epidemic arrived in Vienna on Saturday. The route will be scheduled every Saturday, according to its operator Air China. (Xinhua/Guo Chen)

Air China flight CA841 from Beijing lands at Vienna International Airport, Austria, on Aug. 8, 2020. The first direct passenger flight from Beijing to Vienna since the outbreak of the COVID-19 epidemic arrived in Vienna on Saturday. The route will be scheduled every Saturday, according to its operator Air China. (Xinhua/Guo Chen)