Greece

https://www.hellenicaworld.com/Greece/Geo/en/Greece.html

ranking: total 35 Transportation National air transport system number of registered air carriers: 11 (2020) inventory of registered aircraft operated by air carriers: 97 annual pa
Greece , Greece Online Encyclopedia

Bulgaria

https://www.hellenicaworld.com/Bulgaria/en/Bulgaria.html

ranking: total 56 Transportation National air transport system number of registered air carriers: 8 (2020) inventory of registered aircraft operated by air carriers: 44 annual pas
Bulgaria, World Library

World

https://www.hellenicaworld.com/World.html

energy, metallurgy, and transportation. Improved global communications have greatly reduced the costs of international trade, helping the world gain from the international divisio
World Library, Countries

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