Research methodology
Population: the population used in this study are as follows: passenger airline Air Asia Thailand that have automatic registration machines up at Don Muang airport, Thailand local and foreign tourists.
Sampling methodology : for selecting samples in research. Used to select the sample does not use probability. Category selection (sampling non-probability), for example, a mistake, or because in the example can access to information related to issues that require research is important. It is easier to select the sample and the unit. For example, often cooperate in providing information to high with over time and budgets in the studies is limited. Make the selection of a sample of a chance there is proper research