HOUSTON --Travelers to Mexico have a new route to choose from that's departing Bush Intercontinental Airport. Continental Airlines added a twice-weekly flight from Houston to Tuxtla Gutierrez, Chiapas, Mexico. That's in the southeast region of Mexico. The new service is the 30th Mexican destination for Continental, which it says is more than any other airline. Continental is still awaiting word from federal regulators looking into its merger with United. Once that happens, Continental will become United and the airline's headquarters will move from Houston to Chicago.