China's postal delivery system is mostly dominated by the de facto monopoly, China Posts, which provides a complete national coverage. Compared with counterparts in advanced nations, China Posts’ delivery time is long and its service quality is poor, specifically in remote and rural areas. Express delivery services by China Posts are often available in big cities and economically developed provinces, but rarely extended to remote and rural areas. International services are often jointly offered by China Posts and foreign carriers such as UPS. There are cargo services offered by airlines, railway systems, trucking carriers, and boat transportation companies in big cities.