A passenger shows a certification for flight canceling at the Xinzheng International Airport in Zhengzhou, capital of central China's Henan Province, Aug. 25, 2010. Henan Airlines canceled all flights Wednesday. A passenger plane owned by Henan Airlines crashed in northeast China's Heilongjiang Province Tuesday night. [Xinhua]

Passengers change flights or return tickets after their flights of Henan Airlines are canceled at the Xinzheng International Airport in Zhengzhou, capital of central China's Henan Province, Aug. 25, 2010. Henan Airlines canceled all flights Wednesday. A passenger plane owned by Henan Airlines crashed in northeast China's Heilongjiang Province Tuesday night. [Xinhua]