It is often said as a truism, “if you build it, they will come”, but supply does not always create its own demand. Some links via David King
Plenty of new airports but few passengers in China (LA Times)
The Empty CIty of Ordos (Time)
This is more reason to discount the arguments that just because China is spending a gazillion yuan for high speed rail or highways, the US should, (there are many other reasons they are fallacious comparisons, not the least of which is the stage of development and return on investment, the US network is mature, China’s is not).