The outage began just after 6 p.m. ET and was resolved a few hours later, though delays are expected to continue into the night.

SAN FRANCISCO — United Airlines flights were grounded across the country Wednesday evening due to a “technology issue” that has since been resolved. 

Flights out of San Francisco International in California, George Bush Intercontinental/Houston in Texas, Denver International in Colorado, Chicago OHare International in Illinois, Ronald Reagan Washington National in Washington D.C,, and Newark International in New York were impacted, according to the FAA’s National Airspace System Status. 

“We are working with customers to get them to their destinations after a technology disruption on Wednesday evening,” United Airlines said in a statement. “The underlying technology issue has been resolved, and, while we expect residual delays, our team is working to restore our normal operations.”

The issue had to do with a system that houses and feeds information about each flight into other systems, including those that calculate weight and balance and track flight times, according to United.

Grounding alerts from the FAA started lifting on the West Coast around 9 p.m. ET, with the others clearing around 10 p.m. ET. Delays are still expected due to the outage. 

The outage began just after 6 p.m. ET and was resolved a few hours later, though delays are expected to continue into the night. 

The company is replied to users on social media complaining about delays when the delays first began. 

“We’re sorry for any inconvenience caused. We are aware of the system error and our teams are working to resolve things to have you on your way,” the company wrote on X. 

“We apologize for the disruption today. Our teams are working to resolve the tech outage as quickly as possible, and we appreciate your patience,” they wrote to another user. 

“We’re aware United experienced a technology issue disrupting their operations. Some delays may continue as they work through the recovery process,” the FAA said in a statement. “We’ve offered full support to help address their flight backlog and remain in close contact with United.”

When checking the status of flights on United’s website, delays ranged from an hour to over five depending on the flight’s origin and destination. 

“We want you to know your flight is departing late because we are working to resolve a technology issue,” a message on the website reads. “We value your time and we’re sorry for the inconvenience.” 

No additional information is available at this time and it’s unclear what caused the error, or when it may be resolved.Â