The workers “unintentionally deleted files” on the alert system for pilots, causing thousands of flights to be delayed on Jan. 11, just weeks after another nationwide air travel failure.
F.A.A. Says Outage Was Mistakenly Caused by Contractors


The workers “unintentionally deleted files” on the alert system for pilots, causing thousands of flights to be delayed on Jan. 11, just weeks after another nationwide air travel failure.
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