U.S. prepares to downgrade Mexico air safety rating

The U.S. government is preparing to downgrade Mexico's aviation safety rating, a move that would bar Mexican carriers from adding new U.S. flights and limit airlines' ability to carry out marketing agreements, four sources briefed on the matter said.

The Federal Aviation Administration's (FAA) planned move is expected be announced in the coming days and follows a lengthy review of Mexico's aviation oversight by the agency.

Sources briefed on the matter, speaking on condition of anonymity, said the FAA has had lengthy talks with Mexican aviation regulators about its concerns . . .