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Hafeez also later told a US court that he had trained as a commercial pilot.

As an adult she has had a "wonderfully varied" career path, Ley says, obtaining degrees in economics and accounting while raising three young children, earning a commercial pilot licence, and working in the outback mustering livestock.

A former commercial pilot, Chung started posting on WeChat in February and has in recent months shared his interviews with Asian business owners, Lunar New Year greetings, and his promises to the community, where about one in five voters are ethnically Chinese.

In a medical emergency, cabin crew would administer first aid and seek help from any passengers who were medical professionals, while the captain would use a telecommunications system to get instructions from emergency doctors on the ground, says Marco Chan, a former commercial pilot and a senior lecturer at Buckinghamshire New University.

Gerald Cook, an adjunct professor at Embry-Riddle Aeronautical University, is a former commercial pilot and flight operations manager who flew for Spirit from 1999 to 2010.