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The NTSB found an undiagnosed sleep disorder and an abrupt shift change caused the deadliest of five accidents in a year.

via NBC News Travel http://ift.tt/1pUQ4T9
The NTSB found an undiagnosed sleep disorder and an abrupt shift change caused the deadliest of five accidents in a year.
via NBC News Travel http://ift.tt/1pUQ4T9
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