The company has over 130,000 employees and operates in over 350 destinations worldwide.The airline raised its revenue guidance for the recently ended quarter as demand for air travel remained strong through the holiday season, even as travelers contended with higher fares.

The Federal Aviation Administration (FAA) announced that operations had returned to normal on Thursday, a day after its national pilot-alert system shut down and the agency grounded all domestic flights for nearly two hours.

The operational chaos that engulfed Southwest Airlines Co. over the busy holiday period was a crisis that had been brewing for decades.

This week, the stock market will be put to the test as corporate earnings season begins.

Southwest Airlines Co. is a major airline company headquartered in the United States.