There are now four US airline companies competing for the China-US flights market. UAL and United Airlines initiated the first Sino-American flights in 1986 and currently has the largest share of flights. China airline companies are also entering the competition for overseas travel customers.We interviewed Glenn F. Tilton, Chairman, President & CEO of UAL Corp. and United Airlines about the company's development in China, their partnership with Shanghai Airlines, and if he is still optimistic about the routes.