A staff member of China Eastern Airlines guides migrant workers to register their health condition by cellphone at Zhongchuan International Airport in Lanzhou, northwest China's Gansu Province, Feb. 29, 2020. A charter flight of China Eastern Airlines brought 117 migrant workers from Lanzhou to resume work in the city of Nanchang, east China's Jiangxi Province. (Xinhua/Fan Peishen)