The imminence of the airport network construction is presented. The concept, classification and forming condition of hub airport, regional airport concept and its essentiality are discussed. Suggestion of the national airport system overall planning and layout, including the aim and dimensions of the planning and layout, the structure of the national airport system, the regional airport planning and layout is presented.
4. The current status, developing potential, and planning and layout of those airports in Southwest China are analyzed. Taking the airports in Chengdu, Chongqing, and Kunming as examples, the advantages and disadvantages are compared. The selection of hub airport and the regional airports planning and layout in Southwest China are discussed.