Who serves as the CEO of Southwest Airlines?

The correct answer is that Gary Kelly serves as the CEO of Southwest Airlines. He took on the role in 2004 and has been instrumental in shaping the airline’s operational strategies, significantly contributing to its growth and success over the years. Under his leadership, Southwest has focused on maintaining a low-cost fare structure while ensuring customer satisfaction, making it one of the leading airlines in the United States.

Other choices presented do not hold the position of CEO at Southwest Airlines. Steve Murtoff, Rachel Loudermilk, and Sonya Lacore are notable within the company but have other roles or responsibilities that do not include being in charge of the entire organization. This distinction highlights the importance of knowing the company's leadership for understanding its operational direction and corporate culture.