United Airlines faced significant disruptions on Wednesday evening due to a technology issue affecting its operations. The airline announced a ground stop for its mainline flights at several major U.S. airports, including Newark, Chicago, Denver, Houston, and San Francisco.

A spokesperson for United stated, "Due to a technology issue, we are holding United mainline flights at their departure airports. 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 Federal Aviation Administration (FAA) confirmed the ground stops, noting that they were still in effect at Denver and Newark as of 10:28 p.m. ET. The FAA also indicated that it was providing support to United as the airline worked to address the backlog of flights.

As of 5:30 p.m. ET, approximately 16% of United's flights were delayed, with some cancellations reported. By 11:16 p.m. ET, FlightAware's Misery Map indicated that O'Hare International Airport in Chicago had recorded four cancellations and 68 delays, while Denver had two cancellations and 108 delays.

Later in the evening, United Airlines reported progress in restoring its systems. The airline stated, "The underlying technology issue has been resolved, and, while we expect residual delays, our team is working to restore our normal operations."

The situation remains fluid, and updates will be provided as more information becomes available.