Boeing faces more turbulence even though flight landed safely as it was unclear when or how the panel went missing.
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Boeing whistleblower John Barnett’s death happened the same week as several safety issues with the company’s aircraft.
Coroner’s office in US state of South Carolina says 62-year-old former Boeing employee died on Saturday.
Despite extensive air and sea searches the Boeing 777-200, which disappeared on a flight to Beijing, has not been found.