The Port of Charleston, owned and operated by the South Carolina Ports Authority, is one of the largest ports in the United States, ranked seventh in the top 25 by containerized cargo volume in 2018. It consists of five terminals, and a sixth terminal is to open in 2021. Despite occasional labor disputes, the port is ranked number one in customer satisfaction across North America by supply chain executives. Port activity at the two terminals located in the city of Charleston is one of the city's leading sources of revenue, behind tourism.