RIO DE JANEIRO, BRAZIL - Surrounded by mistrust, Boeing begins 2020 by changing its CEO and facing the greatest crisis in its 103 years of existence.

A new series of documents sent by the company to the US Congress shows that employees knew of the risks presented by the model 737 MAX during the aircraft certification process.

In the messages, the pilots talk about flaws in the aircraft's simulators in the flight control system, the MCAS (Maneuverability Enhancement System), suspected to be the origin of the two crashes that killed 346 people in Ethiopia and Indonesia.

Despite the turbulent period . . .

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