While all airlines were affected, one stood out as the grounding of domestic flights had a cascading effect on air travel: Southwest Airlines.
According to the flight tracking company Flight Aware, Southwest had as many as 49% of its flights delayed as of noon Wednesday.
Anuvu, another site that tracks flights, showed just 7% of Southwest flights were departing on time, compared with 15% for American Airlines, 21% for United Airlines, and 33% for Delta Airlines.
Southwest is still reeling from the huge disruption it experienced over the Christmas holiday that saw an estimated 11,000 of its flights canceled.
Southwest said Wednesday it would rebook customers on the next available Southwest flight with seats available to the customer’s ticketed destination, at no additional cost.