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Flight schools are institutions that carry out training activities in order to ensure quality and competition in the sector and to meet the pilot needs of the sector. Therefore, the aircraft to be used in the training must be chosen correctly. The aim of this study is to determine the aircraft selection criteria of the flight schools, to find the weights of these criteria and to choose the most suitable aircraft alternatives among the preferred flight schools. In the study, MEREC and CoCoSo methods, which are the current Multi-Criteria Decision Making methods, were preferred. The MEREC method was used to find the criterion weights, and the CoCoSo method was used to rank the aircraft. In the literature search, no study was found in which MEREC and CoCoSo methods were used in aircraft selection of flight schools. In the results of the analysis, it has been determined that the three most important evaluation criteria are "standard weight", "fuel tank capacity" and "maximum take-off weight", respectively. The criterion with the lowest degree of importance was the "aviation capability of the engine manufacturer" criterion. "Piper PA-44 Seminole" with alternative 3 codes took the first place among the aircraft alternatives. It is thought that the study will be beneficial to aviation industry and flight school managers. [ABSTRACT FROM AUTHOR]

In this study, the performance of four ground operations agents working in a ground handling company was evaluated using Grey Piprecia and Grey Marcos methods, which are multi criteria decision making methods. As a result of the evaluation of criteria, the criteria of "mastery of technical issues in the job description", "ability to take initiative in difficult situations", and "effective communication skill" ranked first, second and third, respectively. In the performance evaluation, ground operations agent A1 was the best performer. Very few studies using Grey PIPRECIA and Grey MARCOS methods are available in the literature. However, until now there has been no study regarding the performance evaluation of ground operations agents using mentioned methods. With these aspects, the study will fill an important gap in the literature. [ABSTRACT FROM AUTHOR]