U.S. Transportation Secretary Sean Duffy says Mexico isn't being fair to U.S. airlines.

Delta Air Lines and Aeromexico would have to end their joint venture by Jan. 1.

The U.S. The Department of Transportation ordered Delta and Aeromexico to dismantle their joint venture that allows them to make flights between the U.S. and Mexico by Jan. 1.

U.S. Transportation Secretary Sean Duffy says Mexico isn't being fair to U.S. airlines.