The U.S. Justice Department has raised concern about demands by U.S. airlines that the government limit flights of three Middle Eastern rivals to the United States, three sources familiar with the matter have said. Justice Department antitrust officials warned of higher fares and fewer choices for consumers if the Obama administration blocks new flights by Emirates [EMIRA.UL], Etihad Airways and Qatar Airways, the sources told Reuters on condition of anonymity. The U.S.