The National Transportation Safety Board is investigating two braking systems on an American Airlines 757 aircraft that ran off the runway while landing at the Jackson Hole Airport. The aircraft came to a stop about 350 feet beyond the runway on December 29. No one was hurt and the plane wasn’t damaged. The NTSB investigators discovered a component was missing from a cockpit mechanism that controls the speed brake, a set of wing flaps that rotate upward. The agency said it is investigating whether that affected the operation of the system. Investigators are also checking how long it took the

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