This study aims to develop a competitiveness assessment index for global aviation training organizations. The study utilizes the four factors of the Diamond model developed by Michael Porter. To select candidate indices, expert consultations were made, and two stages of Delphi survey were conducted on 24 experts in the area of global aviation training and education. Finally, 19 indices were selected for analysis. In order to assess the reliability of the final indices and justify selection, an empirical study was conducted with 100 participants, yielding statistically significant results. The 19 indices were organized into a three-level hierarchy system, and an analytical hierarchy process (AHP) was conducted to evaluate the importance of each index. The results of the AHP indicated that 'quality of instructors' was the most important index, followed by 'feedback from trainees for the course (level of satisfaction with the course)' and 'director's management skills and leadership'. This study will contribute to enhancing the competitiveness of global aviation training organizations.