Boeing shares tumble again as 737 MAX crisis deepens

Shares of Boeing tumbled again on Monday over its handling of the 737 MAX crisis after US aviation regulators criticized it for withholding key documents for months. The criticism comes as Boeing's efforts to get the FAA to certify the plane to return to service have dragged on. The document is an instant message conversation between Boeing's chief technical pilot for the 737, Mark Forkner, who told a colleague that the performance of Maneuvering Characteristics Augmentation System during a simulation was "egregious" and that he had "basically lied" to regulators inadvertently.
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