Straying from the topic but to go back to Metro Man's comment;
"3000 aircraft movements recorded in the Pearl River Delta one day last year with predictions of 5000 in a few years."
To show the surge of growth continues from China, Hong Kong had over 2,100 flights in its small FIR on Saturday (yes, Chinese New Year travel starting). Almost 1,250 at HKIA.
Add a similar number for Guangzhou, close to 1,000 for Shenzhen and nearly 200 for Macau and the Pearl River Delta terminal area handled about 3,700 flights within an 80NM radius of HK.
Yes other places in the World are doing higher figures but all this has ramped up in less than 15 years.
Hence the difficulty in obtaining slots and the reduction in flights transiting through to Europe.