A staff member cleans an aircraft to prepare it for the upcoming 2019 Asian Business Aviation Conference & Exhibition at Shanghai Hongqiao International Airport in east China's Shanghai, April 15, 2019. The 2019 Asian Business Aviation Conference & Exhibition (ABACE) will be held from April 16 to 18 at a business aviation service center of Shanghai Hongqiao International Airport. The event is participated by about 150 global exhibitors showcasing more than 30 aircrafts. (Xinhua/Chen Fei)