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

A staff member works to prepare 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)

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

Business aircrafts are parked on the tarmac 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)

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

Staff members work to prepare 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)

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

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)