Iranian Financial Engineering Association(IFEA) International Journal of Finance & Managerial Accounting 2588-4379 12 44 2025 01 01 Determining the Factors affecting Aircraft Lay-up Coverage in Iranian Aviation Industry with the Panel Data Approach 67 76 23730 EN Mahmoud Farrokhi Bahar PhD student in insurance finance , science and research department , Islamic Azad University, Tehran, Iran Mohammadreza Asgari Doctorate in Financial Management ,Yadgar Imam University , Islamic Azad University, Tehran, Iran Mohammad Reza Miri Lavasani PhD in Safety Management , Science and Research Unit, Islamic Azad University, Tehran, Iran 0000-0003-2780-7958 Journal Article 2024 08 17 The aviation industry is a new and business industry that is rapidly changing and developing. Hence, its development and changes occur before ratification of relevant laws. For this reason, it is required to identify the relations between the players in the aviation area as best and regulate and codify the air rights related thereto. Therefore, the aim of the present research is to determine the factors affecting aircraft lay-up coverage in Iranian aviation industry with a panel data approach. The present research has analyzed the factors affecting aircraft lay-up coverage using the panel data econometric method, studying on 12 airline companies during 2014 to 2021. Accordingly, the model has been estimated using panel data method in a static mode and the approach of fixed effects in sections and applying the weighted least squares method. In this research, the effect of the number of flights, flight hours, carried passenger, distance traveled, available seat kilometer, passenger capacity factor, weight capacity factor on lay-up coverage in domestic and foreign flights was tested. The results demonstrated that all variables had a significant effect on the lay-up coverage in the domestic flights, but in foreign flights, only the variables of number of flights, flight hours, passenger capacity factor, weight capacity factor had the required significance. http://www.ijfma.ir/article_23730_f87b7d1f666a0a1d86568485a520bffa.pdf