China regulator says the country still has ‘major concerns’ about 737 Max return China, a crucial market for Boeing and the Max, was the first country to impose a ban on the aircraft after a crash in Ethiopia in March 2019 that killed 157 people. Boeing Co. workers stood near an entry door to a 737 Max airplane owned by China-based Lucky Air in April 2020.(Ted S. Warren) China still has major safety concerns about Boeing Co.’s 737 Max, the deputy head of the country’s aviation regulator said Monday when asked if it was considering following others in allowing the plane to fly again.