“Research on the Optimization of Air Route Networks in the Yangtze River Delta and Beijing-Tianjin-Hebei Urban Agglomerations from the Perspective of Spatial Interaction Intensityensity”, JITI, vol. 2, no. 1, pp. 26–37, Apr. 2024, Accessed: Apr. 03, 2025. [Online]. Available: https://itip-submit.com/index.php/JITI/article/view/JITI-22-DOI.pdf