United Airlines Grounds 1,000+ Flights Across US After System Outage

United Airlines experienced a major technology failure involving its legacy Unimatic system, which disrupted flight operations across several key U.S. hubs, including Chicago O'Hare, Denver, Newark, Houston, and San Francisco. The outage affected critical functions such as aircraft weight and balance calculations and dispatch information, leading to the grounding of over 1,000 flights and causing widespread delays and cancellations. Although the problem was resolved within hours, residual delays continued into the following day, significantly impacting passengers nationwide. United Airlines and the FAA confirmed the issue was isolated to United's internal systems and was not related to any cybersecurity threat. The airline has been providing accommodations to affected travelers and is working to restore normal operations. This incident highlights the growing vulnerability of complex airline technology systems, similar to previous outages experienced by other carriers like Alaska Airlines.