Southwest Airlines, the largest operator of the Boeing 737 in the world, has built its network on frequency, reliability, and a deep commitment to short-haul and medium-haul connectivity. With the Boeing 737 MAX now forming the backbone of its modernized fleet, the airline continues to optimize efficiency and capacity across both domestic and interisland routes. Data from Cirium on Southwest’s most frequent 737 MAX routes offers fascinating insight into how the carrier strategically deploys its newest aircraft to balance demand, distance, and cost.