> Southwest had a meltdown over the year-end holidays, which drove thousands of flight cancellations and resulted in an $800 million pretax hit for the fourth q

> Southwest had a meltdown over the year-end holidays, which drove thousands of flight cancellations and resulted in an $800 million pretax hit for the fourth quarter. The airline upgraded scheduling software that couldn’t handle numerous changes to crew assignments during severe winter weather late last year. > The issues Tuesday did not appear to be related to that software. From the article, emphasis added.