The Department of Commerce shall conduct an adequate statewide program for the stimulation of economic activity to develop the potentialities of the State; manage the business and affairs of the Savannah Valley Development; develop state public airports and an air transportation system that is consistent with the needs and desires of the public; develop the state public railway system for the efficient and economical movement of freight, goods, and other merchandise; and enhance the economic growth and development of the State through strategic planning and coordinating activities.