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SAN FRANCISCO, CA - JULY 26:  United Airlines planes are parked at the terminal at San Francisco International Airport on July 26, 2012 in San Francisco, California. United Continental Holdings reported a 37 percent second quarter loss with earnings of $339 million or 89 cents a share compared to $538 million or $1.39 a share one year ago.  (Photo by Justin Sullivan/Getty Images) Justin Sullivan / Getty Images