Information systems are implemented within an organization for the purpose of improving the effectiveness and efficiency of that organization. Capabilities of the information system and characteristics of the organization, its work system, its people, and its development and implementation methodologies together determine the extent to which that purpose is achieved. Air Asia has carry out three type of information system such as yield management system (YMS), customer reservation system (CRS), and enterprise resource planning (ERP) system. This system make Air Asia more effective and efficiency and possibly able to reduce the cost and eliminated inefficiency in their business.