Research Article
Environmental Impact Analysis of Hub-and-Spoke Network Operation
| Passenger flow (ten thousand) | Shenyang | Beijing | Qingdao | Zhengzhou | Guangzhou | Nanjing |
| Shenyang | 0 | 113.5 | 42.8 | 0 | 60.3 | 35.1 | Beijing | 113.5 | 0 | 131.2 | 0 | 411.7 | 85.1 | Qingdao | 42.8 | 131.2 | 0 | 0 | 63.1 | 0 | Zhengzhou | 0 | 0 | 0 | 0 | 79.4 | 0 | Guangzhou | 60.3 | 411.7 | 63.2 | 79.4 | 0 | 149.2 | Nanjing | 35.1 | 85.1 | 0 | 0 | 149.2 | 0 |
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