Southwest’s Mass Flight Cancellations: Will Other Airlines Face Issues?

Southwest canceled some 1,900 flights in the span of 48 hours, leading to huge lines across airports. But just what led to one of the U.S.’s top airlines having to cancel so many flights, and what could that tell us about the aviation sector’s recovery? WSJ’s George Downs looks into how Southwest got here, and whether or not it's likely to happen to other airlines during the holidays. Illustration: George Downs