The bad news for Boeing continues.
The plane quickly routed back to the airport and landed without incident.
The letter also notes that the FBI is conducting a criminal investigation, which could take time to complete.
Photo: Kevin Carter (Getty Images)
Boeings troubles have multiplied in myriad, sometimes surprising ways.
Barnetts family hasaccused Boeing of subjecting him to ahostile work environment, which they believe led to his death.
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