Carnival Cruises: Big Values From The Biggest Cruise Line The name of Carnival Cruises is synonymous with cruise vacations, and Carnival Cruise Lines is now the largest single cruise operator in the business, with its acquisitions of Costa, Cunard, Princess, P&O, Seabourn, the Holland America Line, and five additional cruise operators on North America, Australia, and Europe. In ... https://www.ssogssogtour.com/