 Confident in its expansion, the increasingly dominant carrier at Phoenix Sky Harbor influenced the development of Terminal 4.America West requested that the construction include an auxiliary power facility and an underground cavity to accommodate a future rail station which the airport ultimately agreed to.America West was one of the first airlines to use extensive "cross-utilization", in which employees were trained in a variety of airline jobs, such as pilots being trained in dispatch, and both baggage handlers and flight attendants being trained as gate agents.