Southwest currently has 12 Crew Bases:
Atlanta (ATL), Baltimore (BWI), Chicago (MDW), Dallas (DAL), Denver (DEN), Houston (HOU), Las Vegas (LAS), Los Angeles (LAX), Nashville (BNA), Oakland (OAK), Orlando (MCO), and Phoenix (PHX)
Bases are assigned during training, based on Company operational needs and seniority. When a base opening becomes available, it’s awarded based on Flight Attendant seniority under the Collective Bargaining Agreement (CBA).