A weight and balance computer system malfunction led to a nationwide ground stop for United Airlines flights on Wednesday night, causing widespread delays and cancellations.

“Due to a technology issue, we are holding United mainline flights at their departure airports,” the airline said in a statement. “We expect additional flight delays this evening as we work through this issue. Safety is our top priority, and we’ll work with our customers to get them to their destinations.”

United said the issue began shortly after 6 p.m. ET and was resolved within a few hours—noting that the technical issue was not related to a cyberattack.

The disruption affected several major hubs, with full ground stops issued at airports including Chicago, Denver, Houston, Newark, and San Francisco. As of Thursd

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