for vehicles, such as Prism Plastics, Huron Plastics Group, and International Automotive Components. Michigan Ethanol, a partner of Broin Companies, operates a corn ethanol production facility in southwest Caro. Michigan Sugar Company, an agricultural cooperative owned by 1200 farmers, operates four plants in the area. It is the successor to the 100-year-old "Big Chief" and "Pioneer" Sugar companies. Local plants are located in Caro, Sebewaing, Croswell, and headquarters in Bay City. Domtar operates a paper mill in Port Huron. The plant will close in 2021. Dunn Paper is located at the mouth of the St. Clair River just north of the Blue Water Bridge and produces specialty papers. Keihin Michigan Manufacturing operates an auto part manufacturing plant in Capac, they build HVAC and intake manifold assemblies that are used in Honda vehicles. The plant is scheduled to close in 2021. Champion manufactures small and mid size buses at their facility in Lapeer County's Imlay Township. Sensient Technologies Corporation, Harbor Beach, makes food flavors and colors, yeast dehydrated products and vegetable protein extract. Star of the West Milling Co. which has grain elevators in Vassar and Cass City, joined with Eastern Michigan Grain in Emmett. Huron Castings produces shell molded steel castings in Pigeon, Michigan. Pigeon Telephone Co. has been meeting telecommunications needs of the rural communities it serves since 1908. Agri-Valley Services, more commonly known as AVCI, is an internet service provider based out of Pigeon, Michigan. Thumb Cellular has been providing rural cellular service to the thumb area since 1991. International Trade Corridor The I-69 International Trade Corridor is a strategic commercial gateway between the Midwestern United States and Ontario, Canada, with multi-modal transportation infrastructure that offers a wide range of distribution options. The I-69 International Trade Corridor Next Michigan Development Corporation (NMDC) offers economic incentives to growing businesses, both existing and new, that utilize two or more forms of transportation to move their products and are located within the territory of the NMDC. The I-69 International Trade Corridor Next Michigan Development Corporation is the largest in the state of Michigan with 35 municipal partners. Constituent counties of the trade corridor are: Shiawassee, Genesee, Lapeer, and St. Clair Counties. Tourism Some towns, such as Bay Port, Caseville, Harbor Beach, Lakeport, Lexington, Port Austin, Port Hope, Port Huron, Port Sanilac, Sebewaing, and St. Clair enjoy seasonal tourism, due to their locations on Lake Huron, Saginaw Bay, or St. Clair River.