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All mainline United Airlines flights were grounded on Wednesday due to a technology outage.
United reported to ABC news that the issue came from the system Unimatic, which stores information about the flight's weight, balance and flight time, then transfers the information to other systems. The company has not stated what the specific issue was. More than 1,000 flights were delayed and more than 40 were canceled across the country, even after the issue was resolved.
"Safety is our top priority, and we'll work with our customers to get them to their destinations," said the airline in a statement.Hi there. Thank you for reaching out. We're aware of the system error at this time and are working on a fix to have you on your way as soon as possible. We understand that this disruption has caused frustrations during your travel and appreciate your continued patience. If you… https://t.co/Y6hG6u2Kjj— United Airlines (@united) August 7, 2025
The airline apologized for the glitch and stated that it would pay for hotel and other expenses for some of its customers. The ground stop did not affect United Express flights, and any flight that was already in the air continued to its destination.
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The FAA told the New York Post that United requested the stop and that it was aware of the technology issue. Transportation Secretary Sean Duffy told Fox News that he was briefed on the issue and stated that the outage was specific to United Airlines and was not related to the broader air traffic control system. The airline confirmed to ABC news that the issue was not related to a cyberattack of any sort.