Iyari Tirado Burnat/AP
The FAA downgraded Mexico's civil aviation system because of weaknesses with that nation's air-safety regulation.
As if Mexico doesn't have enough problems, on Friday the Federal Aviation Administration announced that it had downgraded that nation's civil aviation system because of deficiencies in the Mexican government's oversight.
Mexico was dropped from category one status which means a nation's aviation regulators meet the standards of the International Civil Aviation Organization to category 2 which means they fail to meet those standards.
The practical upshot of the downgrade is that while Mexican airlines will continue to be able to maintain their operations in the U.S., they won't be able to expand service.
An excerpt from the FAA's news release:
While Mexico has been responsive to the FAA’s findings and has made significant improvements in recent months, it was unable to fully comply with all of the international safety standards. However, under the leadership of Director General Hector Gonzalez Weeks, Mexico continues to make progress. The FAA is committed to working closely with the Mexican government and providing technical assistance to help Mexico regain its Category 1 rating.
Nations in category two with airlines that fly in and out of the U.S. include Ukraine, Guyana, Indonesia and Israel, according to this Excel table provided by the FAA.