Eleventh Circuit Revives Delta–Aeroméxico Joint Venture by Vacating DOT Termination Order

A significant legal development emerged on August 20, 2026, when the U.S. Court of Appeals for the Eleventh Circuit vacated the U.S. Department of Transportation (DOT)’s 2025 final order terminating Delta Air Lines’ and Aeroméxico’s joint venture and withdrawing its antitrust immunity. The ruling restores the carriers’ ability to maintain integrated operations between the U.S. and Mexico. This decision holds direct strategic importance for Delta and potentially for its revenue mix on key international routes.

Background of the DOT Order

DOT had initially approved and granted antitrust immunity to the Delta–Aeroméxico joint venture in 2016, citing benefits such as increased competition and consumer choice across U.S.–Mexico markets. That approval included conditions like slot divestments at Mexico City’s airport and a five-year immunity term. However, as the JV approached renewal in 2022, DOT issued a show-cause order, arguing that regulatory changes and slot allocation policies at Mexico City’s airport had undermined competitive conditions, prompting a final DOT order in 2025 to terminate the JV and its immunity.

Appeals Court Overturns DOT’s Termination

In a detailed opinion, the Eleventh Circuit found that DOT deviated from its established analytical framework by focusing narrowly on conditions at one airport (Mexico City) rather than analyzing broader network- and country-pair competitive effects. The court also cited DOT’s inconsistent treatment of the U.S.–Mexico case versus U.S.–Japan cases—specifically its decision to impose open-skies compliance as a necessary condition in this case despite exempting similar conditions at Tokyo’s Haneda Airport in earlier decisions. The appeals court deemed DOT’s reasoning “arbitrary and capricious,” and accordingly vacated the termination order. As a result, the joint venture’s approval and antitrust immunity remain intact—for now.

Implications and Next Steps

This ruling allows Delta and Aeroméxico to continue operating under their existing joint-venture structure, preserving coordinated route planning, pricing flexibility, and shared revenue frameworks. The court, however, did not affirm the long-term viability of immunity; DOT retains the authority to revisit the partnership using its standard analytical approach, potentially prompting a new review.

Delta investors should monitor how this decision impacts future U.S.–Mexico traffic, fare structures, and operational synergies. Continued favorable cooperation could support Delta’s international margins, especially in a fuel-cost environment that remains elevated. For now, the ruling removes a significant regulatory overhang and restores stability to a key strategic alliance.