The US Department of Transportation (DOT) has ordered Delta Air Lines and Aeroméxico to end their eight-year joint venture, stating that it gives both airlines an “unfair advantage” as two predominant competitors. On September 15, 2025, the US DOT issued a final order, stating that the joint venture must end by January 1, 2026, preventing the two airlines from jointly coordinating operations between the US and Mexico. The department stated that it is already witnessing some of these effects in the US-Mexico market. The decision to end the joint venture comes after the US Department of Justice (DOJ) backed the removal of antitrust immunity for the Delta–Aeroméxico partnership in August 2025, citing the same concerns echoed by the DOT. Aeroméxico and Delta established a comprehensive partnership through a joint cooperation agreement (JCA) back in May 2017.