四大城市群，疯狂建机场！

Core Viewpoint - The Chinese government aims to establish world-class aviation enterprises and hubs by 2050, enhancing international aviation functions to support a robust transportation system [1] Group 1: Airport Construction Trends - A new wave of airport construction is underway, particularly in the four major city clusters: Guangdong-Hong Kong-Macau, Yangtze River Delta, Beijing-Tianjin-Hebei, and Chengdu-Chongqing [3] - The Guangdong-Hong Kong-Macau area has seen significant developments, including the approval of Yangjiang Airport and the opening of the third runway at Shenzhen Bao'an International Airport, which will accommodate 80 million passengers annually [4] - In the Yangtze River Delta, Jiaxing Nanhu Airport is set to open on December 26, 2025, with initial routes to major cities [5] - The Beijing-Tianjin-Hebei region is enhancing Daxing Airport's capacity, aiming for a total of 72 million passengers annually by 2035 [7] - Chengdu-Chongqing is also expanding, with Chongqing Jiangbei International Airport's new terminal and runway set to handle 80 million passengers annually [8] Group 2: Airport Density and Demand - Despite high passenger traffic, Guangdong-Hong Kong-Macau and Beijing-Tianjin-Hebei regions have a low airport density, with Guangdong having only 9 airports for 21 cities [9][10] - Nationally, there are 259 civil transport airports, with Guangdong ranking ninth in total number of airports [10] - The airport density in Guangdong is particularly low, with only 0.7 airports per 10 million people, compared to other provinces [12][13] Group 3: Future Airport Developments - Cities like Nanjing, Guangzhou, and Chongqing are set to become major players with the development of second airports, enhancing their aviation status [26][29] - Nanjing is transitioning to a dual-airport city with the upcoming civilian function of Ma'anshan Airport, while Guangzhou's new airport is expected to be operational by 2027 [29] - The competition for becoming the leading aviation hub in China is intensifying, with cities vying for increased passenger flow and connectivity [16][21]