Preliminary U.S. investigation says Boeing passenger plane with "fallen door" in mid-air was missing fixing bolts when it left the factory.
NTSB said there was no evidence that the recessed emergency door was opened again after leaving the Boeing factory. Boeing admitted responsibility for the accident in a statement and said it was working to ensure that such an accident never happens again. The report presents only preliminary findings and does not address blame or causes for the incident, which may be revealed in a final report more than a year later.