Autobuses de Oriente, S.A. de C.V. (Autobuses of the East, Inc.; usually known as A.D.O.) is one of the largest Mexican bus companies, running first-class and executive-class buses, and serving roughly the eastern half of the country, with service to most major cities and towns in all or part of the states of Campeche, Chiapas, Guerrero, Hidalgo, Mexico City, Michoacan, Morelos, Oaxaca, Puebla, Quintana Roo, State of Mexico, Tabasco, Tamaulipas, Tlaxcala, Veracruz, and Yucatan. Major metropolitan areas served include those of Mexico City, Puebla, Mérida, Cuernavaca, Tampico, Veracruz, Acapulco, Villahermosa, Reynosa, Cancún, Tuxtla Gutiérrez, Xalapa, Oaxaca, Pachuca, and Tlaxcala.