Southwest Airlines cancels 1,000 more flights as disruptions mount - CNBC

Southwest Airlines canceled more than 1,000 flights, 27% of its schedule, on Sunday as disruptions that the airline blamed on air traffic control issues and bad weather affected the travel plans of thousands of customers.

The Dallas-based airline canceled 808 flights on Saturday, according to flight-tracking site FlightAware.

American Airlines, which operates a large hub in Miami, in comparison, canceled 63 mainline flights, or 2% of its operation and Fort Lauderdale, Florida-based Spirit Airlines canceled 32 flights, 4% of its schedule.

The disparity between Southwest's operation and other airlines fueled speculation on social media that employees were calling out sick.

The Southwest Airlines Pilots Association, Southwest pilots' labor union said that "we can say with confidence that our Pilots are not participating in any official or unofficial job actions.".