Staff workers check a C919, China's first domestically-built large passenger jet, at a hangar of the Commercial Aircraft Corporation of China (COMAC) in Shanghai, east China, May 4, 2017. The maiden flight of the C919 is scheduled for May 5. The flight will depart from Shanghai Pudong International Airport. "If weather conditions are not suitable, the maiden flight will be rescheduled," COMAC said. (Xinhua/Ding Ting)