Cd. of Mexico .- If the Mexican aeronautical authority is again degraded to Category 2 by the Federal Aviation Administration of the United States (FAA), there will be an increase in air service and a blow to Mexican airlines, they warned specialists. Passengers, they added, will have to pay more expensive tickets, as also happened in the last degradation, when the rates went up about 10 percent. Moreover, they would suffer because the degradati…