What may have caused the FAA computer outage that grounded flights for hours

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The nation’s air travel system had another long, difficult day Wednesday. More than 1,100 flights were canceled and 7,700 were delayed when a critical system failed at the Federal Aviation Administration. The outage forced the FAA to call a nationwide halt to operations, wrecking travel plans for millions. Amna Nawaz and Miles O’Brien discuss the reliability and vulnerability of the system.

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