U.S. and Gulf airlines set to clash at aviation summit

By Jeffrey Dastin WASHINGTON (Reuters) - Top executives of U.S. and Gulf airlines will take their dispute over whether "open skies" deals have led to unfair competition to a high-profile public forum in Washington on Tuesday as each side ramps up efforts to sway U.S. regulators. Emirates Airline [EMIRA.UL], Qatar Airways and Etihad Airways have denied the allegations, saying U.S. airlines have lost market share because of their inferior service. The Obama administration has said in statements th