American Airlines grounded all its flights at the start of Christmas Eve - one of the busiest travel days of the year because of a "technical issue", BBC reported.
The Federal Aviation Authority issued a nationwide "groundstop" for AA flights - but that has now been lifted.
Today’s incident comes months after American Airlines grounded all its flights due to an IT crash caused by a faulty software update from the cybersecurity firm Crowdstrike.
American Airlines, among other airlines, grounded its flights for much of July 19.
Delta Airlines was among other operators that were impacted - with more than 42,000 flights were delayed and over 4,700 cancelled worldwide.
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