1. Aegean Group (2019). 2019 Sustainable Development Reports. 22 Kasım 2022 tarihinde https://en.about.aegeanair.com/corporate-responsibility/csr-report/ adresinden erişildi.
2. Aegean Group (2020). 2020 Sustainable Development Reports. 22 Kasım 2022 tarihinde https://en.about.aegeanair.com/corporate-responsibility/csr-report/ adresinden erişildi.
3. Aeroflot (2019). Annual report 2019. 22 Kasım 2022 tarihinde https://ir.aeroflot.ru/en/reporting/annual-reports/ adresinden erişildi.
4. Aeroflot (2020). Annual report 2020. 22 Kasım 2022 tarihinde https://ir.aeroflot.ru/en/reporting/annual-reports/ adresinden erişildi.
5. Air France-KLM Group (2019). 2019 Annual report. 22 Kasım 2022 tarihinde https://www.airfranceklm.com/sites/default/files/q4_2019_press_release_en_8855736.pdf adresinden erişildi.