Southwest warns of more flight cancellations as meltdown draws federal scrutiny

Southwest Airlines canceled nearly two-thirds of its flights Tuesday and warned that mass disruptions will continue throughout the week, drawing scrutiny from the Transportation Department as other airlines recovered from severe winter weather.

Airlines have canceled thousands of U.S. flights over the last week as winter storms brought snow, ice, high winds and bitter cold around the country, derailing travel from coast to coast. But Southwest…