BOSTON—A federal antitrust trial to determine the fate of a partnership between American Airlines Group Inc. and JetBlue Airways Corp. got under way Tuesday with the Justice Department and the airlines clashing over whether the alliance would lead to higher fares.
The department told U.S. District Judge Leo Sorokin that it would present evidence showing that American and JetBlue each planned to compete vigorously at key hubs in the Northeast before they decided instead to join forces in New York and Boston.
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