Southwest Airlines under investigation as more flights canceled after storm

US government says it will look into why the company's recovery from winter storm chaos lags behind other carriers

Southwest Airlines scrubbed thousands of flights again on Tuesday in the aftermath of the massive winter storm that wrecked Christmas travel plans across the US, and the federal government said it would investigate why the company lagged so far behind other carriers.

A day after most US airlines had recovered from the storm, Southwest called off about 2,600 more flights on the east coast by late afternoon. Those flights accounted for more than 80% of the 3,000 trips that got canceled nationwide on Tuesday, according to tracking service FlightAware.