FAA officials said a preliminary review traced the outage to a damaged database file, but added there was no evidence of a cyberattack and the investigation was continuing. FAA officials said they were working to "further pinpoint the causes" so the problem can be avoided in the future. One issue airlines are facing is trying to get planes in and out of crowded gates, which is causing further delays. He described confusion as airline employees and many passengers were initially unaware of the FAA's moves and flight delays. The U.S. Travel Association, which represents the travel industry including airlines, called the FAA system failure "catastrophic."

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