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Air travel was a mess over the holidays \u2014 in the last 10 days of December, 30,000 flights were canceled. \n\nWhile every airline was affected, one stood out: Southwest, which over the past few decades has transformed how Americans fly, melted down. In the last 10 days of the year, it canceled as many flights as it had done in the previous 10 months. \n\nSo what went wrong?\n\nGuest: Niraj Chokshi, a business reporter for The New York Times.