The United States has lifted its restrictions on Mexican airlines. The decision closes a bilateral aviation dispute that reshaped one of the world's busiest international air markets.

The dispute dates to 2021, when the US Federal Aviation Administration downgraded Mexico to Category 2 under its International Aviation Safety Assessment program. That single regulatory verdict carried hard commercial consequences. It barred Mexican carriers from adding new service or aircraft to US routes. It froze codeshares with American airlines. It capped the market at pre-downgrade capacity while demand kept climbing.

What does this change for airlines and passengers? For carriers such as Aeromexico, Volaris and Viva Aerobus, the answer is capacity. Category 2 blocked fleet expansion into US markets for the duration of the downgrade. Mexican low-cost carriers, in particular, built their networks around cross-border traffic to visiting friends and relatives. With the curbs lifted, those airlines can again file new routes, add frequencies and place additional aircraft into US service — subject only to slots, gates and bilateral treaty limits.

For US carriers, the change removes an asymmetry. American Airlines, Delta, United and their peers could keep growing in Mexico while Mexican competitors could not. Codeshare arrangements suspended under Category 2 can now be reviewed and restored, which matters for joint itineraries connecting US hubs to points beyond Mexico City.

For passengers, the practical question is fares. Capacity constraints at a time of strong demand typically push prices up. New entrants and added frequencies tend to push them down. How quickly fares respond depends on how fast airlines move aircraft and slots into the market.

What was actually at issue?

The FAA's IASA program audits whether a country's civil aviation authority meets standards set by the International Civil Aviation Organization. Category 2 means the regulator — in Mexico's case, the AFAC — fell short on oversight: inspector training, licensing, or surveillance. It is a verdict on the regulator, not directly on the airlines.

Mexico regained Category 1 in 2023 after the AFAC addressed the FAA's findings. Yet the restrictions now lifted outlasted that restoration. Readers should note the sequence. A safety rating recovered; the commercial curbs lingered. The gap between the two is a reminder that regulatory repair and market access do not move on the same clock.

What remains unverified?

The announcement confirms the lifting of the curbs. It does not, on its own, confirm which specific routes, codeshares or capacity additions will follow first. Airlines will disclose those decisions through schedule filings, not press releases. Watch the slot requests at Mexico City and the border-crossing frequencies at San Diego, El Paso and the Texas gateways. Those filings, not statements, will show the real size of the change.

A caveat belongs here. Lifting curbs restores opportunity, not guaranteed growth. Aircraft availability, pilot staffing and airport congestion in Mexico City still constrain how much capacity any carrier can deploy. The market will absorb the change at the pace of those constraints, not at the pace of the announcement.

What does this change for the bilateral relationship? It removes aviation from the list of frictions between Washington and Mexico City. Both governments now have an interest in keeping it off that list, and the FAA will keep auditing the AFAC to make sure the repair holds.