Chi, Yu-Ho. “Navigating Turbulence — Resilience and Strategies of Major U.S. Airlines in Business Continuity, Operations, and Sustainability”. International journal of economic perspectives 19, no. 12 (December 27, 2025): 110–133. Accessed April 18, 2026. https://ijeponline.org/index.php/journal/article/view/1118.