Southwest Airlines has been profitable for 37 years through a unique low-cost business model. They streamline operations to save money and pass savings to customers through low fares. Southwest flies short point-to-point routes daily using Boeing 737 aircraft, turns planes around extremely fast, hedges fuel prices to save billions, and pioneered services like same-day freight. Their consistency in earning profits even during industry problems allows flexibility that burdened carriers lack. However, always running half-full flights and price wars present risks to maintaining low fares long-term.