Carnival Corporation & plc is the world's largest cruise company and, as of 2026, owns and operates nine distinct cruise brands. The most famous is the flagship Carnival Cruise Line, known for its "Fun Ships." Other major brands in the portfolio include the luxury-focused Princess Cruises and the premium Holland America Line. For ultra-luxury and expedition travel, they own Seabourn. In the European market, they operate Costa Cruises (Italy), AIDA Cruises (Germany), and P&O Cruises (UK). Additionally, they own the iconic and historic Cunard Line, famous for its traditional transatlantic crossings on the Queen Mary 2. Finally, they operate P&O Cruises Australia, which is integrated into the regional South Pacific market. Together, these brands represent nearly 100 ships and approximately 50% of the global cruise market. Despite being part of the same parent company, each line maintains its own distinct atmosphere, target demographic, and service standards.