U.S. aviation giants split on Gulf carrier subsidy row

A push by three U.S. airlines to curb competition from Gulf state carriers has exposed divisions over free trade with other powerful U.S. aviation players including Boeing Co and FedEx Corp, potentially complicating the airlines' campaign for Obama administration support. Delta Air Lines Inc, United and American Airlines have asked the White House to look into the financial statements of competitors from Qatar and the United Arab Emirates, which they accuse of receiving more than $40 billion in