On Sunday, Boeing revealed it knew of a possible safety flaw on its 737 MAX aircraft in 2017 but did not notify airlines or regulators until after last October’s Lion Air crash in Indonesia that killed all 189 people on board. A sensor warning on the planes only worked if an additional optional safety feature was also purchased. Boeing told the Federal Aviation Administration about the issue after the Lion Air crash, but the FAA decided no urgent action was needed.
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