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Boeing executives, FAA engineers and global aviation regulators have extended the safety analyses to cover a growing list of almost all the issues from emergency recovery process to potentially suspect electronic components.

Boeing's software update hasn't yet been approved by the FAA, and it's unclear what additional pilot training will be required before approving the MAX's return to commercial service. European and other regulators may impose different requirements at different times that could lead to a staggered return of the jet to service.

Boeing said it lost 6 million in 2019 compared with a profit of .46 billion in 2018.

Born in a small town of northwest China's Shaanxi province, Zhang was brought up by his grandma. In 2008, he went to university in Beijing, and the only way for his grandma to see him was through video calls.

Big-air snowboarding is a new Winter Olympics event that involves snowboarders hurling themselves off a snow ramp in aerial stunts including complex flips and spins before landing on a slope.