Carnival is one of ten cruise line brands owned by the world's largest cruise ship operator, the American-British Carnival Corporation & plc. In 2018 Carnival Cruise Line was estimated to hold an 8. 9% share of cruise industry revenue and 22. 0% of passengers. It has 26 vessels and is the largest fleet in the Carnival group. The ships fly flags of convenience; 18 of the ships fly the Panama flag, six of the Bahamas and two of Malta. Its headquarters are in Miami, Florida, the United States. The North American division of Carnival Corporation has executive control over the corporation and is headquartered in Doral, Florida.