Turbulence

One aeroplane Air Canada 38 was landed unexpectedly after it was involved by turbulence on the way to Canada from Shanghai. The type of the aeroplane was Boeing 777.
Another aeroplane JAL was also involved by turbulence and landed in Osaka, the type of the aeroplane happened to be the same one.
Turbulence is a cry of atmosphere, but it sometimes shows its fang to humans.