United Airlines, along with other major U.S. carriers like American and Delta, experienced significant travel disruptions on December 7, 2025. The industry faced a total of 141 new cancellations and 2,760 delays, grounding thousands of passengers across key airports including Chicago, Los Angeles, and Dallas. The widespread issues were attributed to a combination of operational challenges and severe weather conditions. United and its regional operators, SkyWest and Mesa Airlines, reported major disruptions. For instance, SkyWest alone accounted for 240 of the delays, highlighting the extensive nature of the day's travel difficulties for the carriers.