US Mexico Aviation Dispute Eases with Slot Restoration at AICM

Navigating Turbulence: The U.S.-Mexico Air Travel Dispute Eases

The skies between the United States and Mexico are clearing up after a period of significant turbulence. At the heart of the issue lies access to Mexico City’s Benito Juárez International Airport (AICM), the country’s busiest and most congested air hub. For months, a dispute over flight slots, the designated times airlines are permitted to take off or land, has strained aviation relations, impacting major carriers on both sides of the border and leaving travelers caught in the middle. The core of the conflict stemmed from a unilateral decision by Mexican authorities to reduce the number of operations at AICM to alleviate congestion, a move that directly affected U.S. airlines and was viewed by the U.S. Department of Transportation (DOT) as a violation of the existing air transport agreement.

This wasn’t just a simple scheduling disagreement; it was a complex issue with significant economic and logistical implications. The reduction in slots forced airlines like American, Delta, and United to scale back their services, disrupting established routes and limiting options for passengers. In response, the U.S. DOT took retaliatory measures, revoking approvals for new routes requested by Mexican carriers. The situation highlighted the delicate balance of international aviation agreements and the critical importance of airport access in maintaining a competitive and open market for air travel. The recent announcement by Mexican President Claudia Sheinbaum that slots will be returned to U.S. carriers marks a pivotal moment in de-escalating this tension and restoring a sense of normalcy to one of the world’s busiest international air corridors.

The resolution, however, introduces new dynamics, particularly with the involvement of Mexicana, Mexico’s state-run airline. The decision for Mexicana to hand over some of its own slots at AICM to U.S. carriers is a significant gesture. It not only paves the way for the restoration of previously cut services but also signals a renewed commitment to cooperation. As we unpack the layers of this dispute, from its origins in airport congestion to its resolution through diplomatic and regulatory channels, it becomes clear that the path forward involves not just returning to the status quo but also establishing a more transparent and equitable system for managing airport capacity in the future.

The Roots of the Conflict: Congestion and Unilateral Cuts

The dispute traces its origins back to 2022, when Mexican aviation authorities initiated measures to address long-standing congestion issues at AICM. The airport, a critical hub for Latin America, was struggling to handle its volume of traffic. Initially, the government mandated a reduction in hourly flight movements from 61 to 52. This was later followed by a more drastic cut, bringing the number down to 43 operations per hour. The official justification for these reductions was the need to ease operational pressure and facilitate construction work. However, critics pointed out that the promised construction never materialized, leading to suspicions that the move was also intended to encourage airlines to shift their operations to the newer, but more distant, Felipe Angeles International Airport (AIFA).

This reduction had an immediate and direct impact on both Mexican and U.S. airlines. Carriers like Aeromexico, Viva Aerobus, and Volaris, alongside their American counterparts, American Airlines, Delta Air Lines, and United Airlines, were forced to adjust their schedules and, in some cases, cancel routes. The U.S. Department of Transportation (DOT) argued that these actions were not in line with the U.S.-Mexico air transport agreement, which is designed to ensure fair and equal opportunity for airlines from both nations to compete. The DOT’s stance was that any changes to slot allocations should be made through a transparent and mutually agreed-upon process, not by unilateral decree.

The situation escalated as the U.S. government responded with its own set of measures. In a clear signal of its disapproval, the DOT revoked its approval for more than a dozen routes that had been requested by Mexican carriers. This retaliatory action effectively froze expansion plans for Mexican carriers into the U.S. market, creating a stalemate that benefited neither side. The standoff underscored the interconnectedness of the two countries’ aviation markets and the potential for significant disruption when international agreements are perceived to be violated. It became evident that a resolution would require not just a reversal of the slot cuts but a renewed commitment to the principles of the bilateral agreement.

The core of the story is the ongoing tension and recent de-escalation between Mexico and the U.S. over aviation rights and airport access.

A Path to Resolution: Diplomacy and a Return to Standards

The turning point in the dispute came through a series of discussions and commitments between Mexican and U.S. officials. In October 2025, the Mexican government formally pledged to return the slots that had been taken from U.S. carriers. This commitment was a crucial first step, although the U.S. DOT noted at the time that the implementation of this promise was still pending. The breakthrough was further solidified in November 2025, when President Claudia Sheinbaum announced that the state-run airline, Mexicana, would facilitate the process by handing over some of its own slots at AICM to the affected U.S. airlines. While the exact number of slots was not specified, the announcement was a clear and public signal of Mexico’s intent to resolve the issue.

This resolution is not just about restoring the previous flight schedules; it’s also about establishing a more stable and transparent framework for the future. As part of the agreement, Mexico has pledged to adopt an international reference system for slot allocation beginning in 2026. This move is aimed at improving transparency and ensuring that the process for assigning take-off and landing times is fair and in line with global best practices. For U.S. airlines, this means a more predictable operating environment and a reduced risk of similar disputes arising in the future. According to the DOT, the restoration of these slots could allow U.S. carriers to resume their full services by the summer 2026 season.

The involvement of Mexicana, the recently revived state-owned airline, adds an interesting dimension to the resolution. By ceding some of its valuable slots at the capital’s main airport, the Mexican government is demonstrating a tangible commitment to making things right. This move also subtly addresses the underlying issue of capacity at AICM and the government’s broader strategy for its aviation sector, which includes promoting AIFA as a viable alternative. The resolution, therefore, represents a multi-faceted approach that addresses the immediate concerns of U.S. carriers while also laying the groundwork for a more sustainable and cooperative aviation relationship moving forward.

Conclusion: Rebuilding Trust and Looking Ahead

The resolution of the flight slot dispute between Mexico and the United States marks a significant step toward normalizing relations in one of North America’s most vital aviation markets. The agreement to return slots to U.S. carriers at AICM not only restores critical air connectivity but also reaffirms the importance of adhering to bilateral agreements that ensure fairness and reciprocity. For travelers, this de-escalation is welcome news, as it promises the return of more direct flights, increased competition, and potentially more stable pricing. The episode serves as a case study in international aviation diplomacy, demonstrating how disagreements over airport access can escalate into broader trade tensions and how dialogue and a commitment to established standards are essential for their resolution.

Looking to the future, the commitment by Mexico to adopt an international system for slot allocation by 2026 is perhaps the most significant long-term outcome of this dispute. This move toward greater transparency and standardized procedures should help prevent similar conflicts from arising in the future. It provides a clearer framework for all airlines operating in Mexico and strengthens the foundation of the U.S.-Mexico air transport agreement. As the aviation industry continues to recover and grow, the ability to manage capacity at key hubs like AICM in a fair and efficient manner will be crucial for sustaining a healthy and competitive market that benefits airlines and consumers alike.

FAQ

Question: What was the core issue of the dispute between the U.S. and Mexico?
Answer: The dispute centered on the Mexican government’s decision to reduce the number of flight slots at Mexico City International Airport (AICM), which impacted U.S. airlines. The U.S. Department of Transportation viewed this as a violation of the bilateral air transport agreement.

Question: Which airlines were affected by the slot reductions?
Answer: Both U.S. and Mexican carriers were affected. The U.S. airlines included American Airlines, Delta Air Lines, and United Airlines. Mexican airlines such as Aeromexico, Viva Aerobus, and Volaris were also impacted by the capacity reductions.

Question: How was the dispute resolved?
Answer: The Mexican government committed to returning the flight slots to the U.S. carriers. The state-run airline, Mexicana, agreed to hand over some of its slots at AICM to facilitate this process, following discussions with the U.S. DOT.

Sources

• Reuters