United Grounds Flights Nationwide Over Tech Issue

United Airlines halted all mainline departures at major U.S. airports on the evening of August 6, 2025, due to a significant technology issue, prompting a nationwide ground stop. Major United hubs including Chicago O'Hare, Denver, Newark, Houston, and San Francisco were affected, with the Federal Aviation Administration confirming ground stops at these locations. The outage, which began surfacing around 8 p.m. EDT, resulted in hundreds of delays and some cancellations, while United Express regional flights were not impacted. Passengers reported being stuck on planes at gates or on tarmacs, though flights already airborne continued operating. United Airlines cited safety as its top priority and stated it was working to resolve the issue, without immediately disclosing the root cause. This event is the latest in a series of technology-related disruptions among major U.S. airlines.