Southwest Airlines has officially launched assigned and premium seating in response to customer demand for more options, including extra legroom, preferred and standard seating, along with a new group-based boarding process and elevated travel experience. Standard: Standard legroom seats located at the back of the cabin. Groups 1-2: A-list preferred, choice extra fare, extra legroom seat purchase or upgrade (including A-list members who upgrade at no additional cost to extra legroom seats within 48 hours prior to departure, when available). However, if customers need to change their flight, they will be able to upgrade to choice, choice preferred or choice extra. However, if customers need to change their flight, they will be able to upgrade to choice, choice preferred or choice extra.