Southwest Airlines is set to introduce a new baggage fee structure starting May 28, marking a departure from its long-standing policy of allowing passengers to check bags for free, a hallmark of its service for over five decades. The change, influenced by a firm that secured board seats last year, will require most passengers to pay for checked bags, aligning Southwest more closely with industry norms. While this move aims to boost revenue and enhance financial performance, it may impact customer loyalty, as the "bags fly free" promise has been a significant draw for travelers.