Two air planes are seen in Changshui Airport in Kunming, provincial capital of southwest China's Yunnan province, Nov. 30, 2013. The airport has shut down again on Saturday as heavy fog kept shrouding the major air hub. Visibility hasn't improved and the airport's runways are not suitable for taking off and landing. The airport closed since Friday afternoon with nearly 10,000 passengers detained. (Xinhua/ Yang Zheng)
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