Airport construction and other aviation infrastructure projects will be opened up to foreign investors, a top aviation official told a meeting of the Civil Aviation Authority of Singapore (CAAS). Yang Guoqing, deputy director of the General Administration of the Civil Aviation of China (CAAC), said foreign investment was now limited to air traffic control systems. He said China would also implement reforms opening up more airports to international services, and relax restrictions on budget airlines. China has built 48 new airports, and renovated or expanded more than 80 others since 1978, he said. In that time, annual passenger traffic has gone from 2.3 million to 87.6 million.