Ruciński , Andrzej, and Konrad Madej. “Polish Air Transport Market in the Perspective of the Year 2030”. Studia Oeconomica Posnaniensia 4, no. 7 (July 31, 2016): 7–38. Accessed September 3, 2026. https://journals.ue.poznan.pl/soep/article/view/3476.