China and Japan signed an agreement in Beijing on Thursday to expand mutual aviation market by increasing 20% passenger flights and double cargo volume, said Xinhua.   The agreement is signed between Director of China's General Administration of Civil Aviation, Yang Yuanyuan, and Japan's Land, Infrastructure and Transport Minister Kitagawa Kazuo, paving the way for the expansion of two-way air traffic by an equivalent of 92 B767-300 passenger flights and 76 B767F cargo flights every week.   Both countries also allow two more cities for departure and arrivals. The new regulations over flight operation and flight crossing increase the industry’s flexibility.   Statistics from China's General Administration of Civil Aviation showed that China has become Japan's second largest international market for air traffic and Japan is China's largest international air traffic market. Nine Chinese and Japanese airlines now operate routine flights among 19 Chinese and 17 Japanese cities.   In 2005, the China-Japan passenger and cargo volume reach 6910000 and 300000 tonnes respectively.   As a result of political tension over the years, this is the first aviation agreement guarantees reciprocal cooperation between the China and Japan since the agreement signed on civil aviation in 1974.