BUGAYKO, D., KHARAZISHVILI, Y., LIASHENKO, V., & KWILINSKI, A. (2021). SYSTEMIC APPROACH TO DETERMINING THE SAFETY OF SUSTAINABLE DEVELOPMENT OF AIR TRANSPORT: INDICATORS, LEVEL, THREATS. Journal of European Economy, 20(1), 146–182. https://doi.org/10.35774/jee2021.01.146