A series of severe storms and winter weather have wreaked havoc on U.S. air travel, leading to over 4,000 flight cancellations in a single day and nearly 20,000 cancellations and delays over the past week. Major travel hubs, particularly Atlanta and Chicago, are facing massive disruptions, resulting in widespread frustration among passengers and a significant impact on airline operations, highlighting the continuing challenges posed by seasonal weather patterns to national transportation systems.