Medical workers on board a plane cheer for themselves before leaving for Hubei Province at Chengdu Shuangliu International Airport in Chengdu, southwest China's Sichuan Province, Feb. 21, 2020. Chengdu Airlines' four China's domestically-developed ARJ21 aircrafts and one Airbus plane with 231 health workers and medical supplies flied to Hubei on Friday to help fight against the novel coronavirus. (Xinhua/Liu Kun)
