Travelers using Southwest Airlines SEA Terminal may anticipate a simplified luggage process that complements the airline's renowned customer-first philosophy. Southwest mostly operates out of SEA's B Concourse, which features self-service kiosks, specialized check-in desks, and a productive luggage drop system to speed up the check-in procedure. Among the main U.S. airlines, Southwest stands out for providing two complimentary checked bags per booked passenger, which makes them a popular option for passengers who are carrying luggage.