There is a ground stop for United Airlines flights at multiple airports across the country Wednesday evening, impacting major hubs like Chicago O'Hare International Airport.

United said in a statement that a "technology issue" is causing them to hold departures.

"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," the statement continued.

The technical issues are also impacting airports in Denver, Houston, San Francisco and Newark.

United said flights that are already in the air can continue to to their destination and United Express' regional flights are not affected, but may be delayed going into some of the airline's hubs because the ground stops have caused a

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