Southwest Airlines canceled more than 400 flights across the Christmas weekend due to dense fog.The airline's operation is "stable and healthy" as of Tuesday, with only a few cancelations. Southwest managed to avoid a repeat of its infamous 2022 holiday meltdown. NEW LOOK Sign up to get the inside scoop on today’s biggest stories in markets, tech, and business — delivered daily. Read preview Thanks for signing up! Access your favorite topics in a personalized feed while you're on the go. Email ...