The fate of a ten-day national teachers’ strike that has paralysed thousands of schools across southern Mexico hung in the balance on Wednesday, as the dissident CNTE union’s negotiating team returned to the Interior Ministry in Mexico City for a decisive round of talks. The meeting, attended by the ministers of the interior, education and the ISSSTE social security institute, came just hours before the union threatened to march on the capital’s international airport – a flashpoint that would thrust the labour dispute into the global gaze less than a year before the country co-hosts the 2026 World Cup. For President Claudia Sheinbaum’s administration, the choreography of the day was as much about containing domestic disruption as it was about projecting stability to international partners.

Viewed from the southern states most affected by the walkout, the government’s latest overture feels distant. In Oaxaca, Chiapas, Guerrero, Michoacán and Zacatecas, more than 1.4 million students remain locked out of 17,000 school campuses, with the end of the academic cycle in jeopardy. The education secretary, Mario Delgado, used the morning press conference to call on teachers to evaluate proposals already tabled: the abolition of the unpopular teacher evaluation unit Usicamm and a parametric reform of the 2007 ISSSTE pension law. Yet for the rank-and-file assembled in a permanent encampment on Calle 20 de Noviembre in the historic centre, these concessions fall short. The union insists on nothing less than the full abrogation of the 2007 ISSSTE law, a demand that has hardened during overnight assemblies that concluded only in the early hours of Wednesday.

Analysts in the capital point to a jarring fiscal reality that constrains the government’s room for manoeuvre. The ISSSTE director, Martí Batres, has estimated that meeting the CNTE’s pension demands would cost more than 7 trillion pesos – equivalent to 20 percentage points of gross domestic product, a sum that would shatter the budgetary prudence Mexico has painstakingly signalled to markets. This hard arithmetic explains why, despite three previous rounds of dialogue, no concrete agreement has emerged. Historical memory also colours the standoff. The union’s most militant factions recall their 127-day strike in 2016 against Enrique Peña Nieto’s education reform, a marathon of road blockades and encampments that ended only after a brutal political attrition. That precedent looms as a warning that the current stoppage, now in its second week, could still metastasise.

Looking ahead, the immediate trigger for a sudden escalation or a face-saving truce is the union’s threat to close the international airport, timed deliberately to test the government’s resolve as the World Cup inauguration events programme gathers pace. From Washington and European capitals, the optics of stranded travellers and televised clashes would cast a pall over Mexico’s readiness for the tournament. Yet for the teachers camped in the capital and holding out across the sierra, the fight is deeply domestic: a generational grievance over precarious retirement conditions that no amount of global scrutiny is likely to dissolve. The most likely scenario remains a protracted negotiation in which the government edges towards further regulatory tweaks while the union preserves its mobilisation capacity, a choreography of managed tension that keeps classrooms empty but stops short of an airport showdown – for now.