Nguyen Thi, Minh-Anh. ā€œA Longitudinal Perspective on Efficiency of Airlines in Europe and the U.Sā€. SEISENSE Journal of Management 4, no. 2 (March 6, 2021): 11–24. Accessed November 1, 2026. https://www.stage.seisense.com/index.php/jom/article/view/591.