American Airlines filed an application with the U.S. Department of Transportation seeking approval to launch nonstop service from Los Angeles International Airport to Pudong International Airport in Shanghai, China, beginning April 5, 2011.These new flights would be the only nonstops between Los Angeles and Shanghai operated by a U.S. airline,said Will Ris, American’s senior vice president  government affairs.Los Angeles-Shanghai is the largest U.S. China market for air travel and we believe it is in the public’s interest to offer more air service between the two cities and to provide new connecting opportunities for passengers traveling to other points in the U.S. and China.American already offers between Chicago and both Shanghai and Beijing.