A helicopter takes off for Hong Kong at Baoan International Airport in Shenzhen, south China's Guangdong Province, June 28, 2019. The first cross-border helicopter flight was conducted on Friday between Shenzhen and Hong Kong Special Administrative Region. An Airbus H135 light twin-engine helicopter took off from Shenzhen Baoan International Airport and landed at Hong Kong Xinde Heliport on Friday morning with an around 15-minute cross-border flight. (Xinhua)