The purpose of this paper is to analyze the operation of passenger check -in desks of Nok Air at the Nakhon Si Thammarat airport, Thailand in order to simulate the operational model to improve efficiency in processes. This is because its functions describe how the objects move between the elements and model a variety of real processes. The methodology in this research is to implement the SimQuick process simulation software which helps analyze emerging needs of major objects model and determine

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... the flow of operations, including entrances, work stations, buffers, and decision points and exits. By collecting useful data, the simulation model of how the check-in desk of the airline is operated can be accurately drawn, and conclusions as well as suggestions can be made. The approach formulated demonstrates the efficient allocation of resources and the resolution of operational issues that could prevent ultimate outcomes.