Dr. Hakan ÇORA. “IMPACT OF COVID-19 ON GLOBAL AND TURKISH AVIATION SECTOR – PROACTIVE AND PREEMPTIVE MEASURES DURING AND AFTER PANDEMIC”. International Journal of Advanced Science and Technology, Vol. 29, no. 08, May 2020, pp. 2825 -1, https://sersc.org/journals/index.php/IJAST/article/view/24752.