Boeing shares are down by a third since the start of this year and are on the hunt for a new chief executive.
The company has been in crisis since part of the body of a new Boeing 737 Max 9, flown by Alaska Airlines, broke off after take-off in January.
US regulators have said their investigating claims by a union that Boeing retaliated against two employees who raised concerns about other Boeing jets. Boeing said it was trying to improve its safety culture.
Passengers escaped serious injury, but the incident led to thousands of flight cancellations and renewed scrutiny of Boeing.
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