From USA Today (link):
U.S. airline competition for China has heated up.
Fort Worth-based American Airlines on Sunday began flying daily Chicago-Shanghai flights, marking the first service ever to China by the world’s largest carrier.
American’s daily 14-hour, non-stop flight creates direct competition with United Airlines‘ 2-year-old service on the route, and underscores the frenzy among big U.S. carriers to exploit China’s explosive economic growth.