With FAA downgrade, Mexican airlines can't add flights out of San Antonio FacebookTwitterEmail FILE - In this Nov. 18, 2020 file photo, a worker wearing a mask walks past a Boeing 737 Max 9 built for Aeromexico as it is prepared for a flight from Renton Municipal Airport, in Renton, Wash. U.S. regulators have downgraded Mexico's aviation safety rating, Tuesday, May 25, 2021, a move that prevents Mexican airlines from expanding flights to the United States just as travel is recovering from the pandemic. (AP Photo/Ted S. Warren, File)Ted S. Warren, STF / Associated Press Mexican airlines have been adding service at San Antonio International Airport at a rapid pace due to unprecedented passenger demand, but a Federal Aviation Administration ruling has slammed the brakes on future expansion.