Southwest is the only one of the four largest U.S. airlines to have never filed for bankruptcy protection. Today, Southwest carries more passengers than any other U.S. airline and operates more ...

But Southwest is doubling down on the Chicago market with a new advertising campaign that pokes fun at iconic city staples, like Italian beef, giardiniera and the region’s long winters.

Southwest Airlines will charge $35 for the first checked bag and $45 for the second, starting May 28, ending its long-standing free baggage policy. ... which has been a key part of its advertising.

Southwest Airlines will charge $35 for the first checked bag and $45 for the second, starting May 28, ending its long-standing free baggage policy. ... which has been a key part of its advertising.