中国最大城市群，正在拼命建机场

Group 1 - The article discusses the emergence of a world-class airport cluster in the Yangtze River Delta, highlighting the recent openings of new airports such as Bozhou Airport and Lishui Airport, which contribute to the region's growing airport network [4][5][10]. - By the end of 2025, the Yangtze River Delta is expected to have 28 large airports, accounting for 10% of the national total, making it the region with the highest airport density and the most extensive flight routes in China [10][18]. - The article notes that despite the high density of airports, some cities still lack direct airport access, with only 9 cities without airports, primarily due to proximity to major urban centers [21][22][30]. Group 2 - The construction of airports is seen as a significant driver of economic growth, with national civil aviation fixed asset investment exceeding 100 billion yuan for five consecutive years [34][37]. - The Yangtze River Delta is identified as the biggest beneficiary of this airport construction boom, while regions like Xinjiang and Sichuan are also benefiting from infrastructure investments [37][39]. - The article predicts that the construction of second airports in major cities will continue, with cities like Guangzhou and Chongqing already planning their second airports [39][40][41]. Group 3 - The article emphasizes that airports are more cost-effective than high-speed rail in certain regions, particularly in western and northeastern China, where the cost of building high-speed rail is prohibitively high [44][47]. - It highlights that the competitive edge of airports increases with distance, especially in areas with complex terrain and low population density, making them a viable option for connectivity [45][46]. - The article concludes that the future leading province for airports will likely emerge from regions currently investing in airport infrastructure, such as Xinjiang and Sichuan [48].