At some point, mainland China will need more than three international hub airports. Funneling the international traffic of a country of 1.3 billion people through Beijing, Shanghai and Guangzhou will not make sense forever, and even now the geographical distribution of the three is awkward. The hubs, each the base of one of China's three biggest airlines, are on the eastern and southern periphery of China's main population zone, so the country lacks a central or western gateway.
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