The Trump administration ordered Delta Air Lines and Aeromexico to end by Jan. 1 their nearly decade-old joint venture that allows them to coordinate schedules and prices for flights between the U.S. and Mexico.

"This action is necessary because of ongoing anticompetitive effects in U.S.-Mexico City markets that provide an unfair advantage to Delta and Aeromexico as two predominant competitors and create unacceptable actual and potential harm for stakeholders, including consumers," the Transportation Department said in a filing late Monday.

Both Delta and Aeromexico said in separate statements that the carriers were disappointed by the department's decision and were reviewing the order before considering next steps. Delta said it will "cause significant harm to U.S. jobs, commu

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