The investigation has already revealed that bolts were never replaced after the door plug was removed during a repair.

The nation's top safety investigators concluded there were multiple systemic failures that led to a midair blowout during the ...

Boeing will be back in the hot seat Tuesday as the National Transportation Safety Board holds a hearing to present its findings from an investigation into the terrifying ...

NTSB Chair says systemic failures led to door plug flying off Boeing 737 Max plane mid-flight in January last year.