Chinese air crew learn kung fu to combat attacks from angry passengers dubbed the 'air rage tribe' who are incensed by delays

• Hong Kong Airlines will teach cabin crews wing chun, a form of Kung Fu 
•  They have experienced on average three attacks from passengers a week 
• Protests from frustrated customers have been reported across the country 
• No airports in China have managed to keep more than 50 per cent of flights on time this summer

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