United Airlines implemented a full ground stop at Chicago O'Hare International Airport on April 28, 2026. A severe weather system forced the operational halt at the carrier's primary hub.
O'Hare recorded 1,228 flight delays during the weather emergency. The airport also reported 260 total cancellations. These disruptions place United's evening transatlantic flight schedule at severe risk.
The situation marks the worst day of a broader post-Easter aviation crisis across the United States. National flight disruptions exceeded 5,500 delays. Total cancellations across the country reached 350.