 For example, Carnival Cruise Line and Holland America Line are the cruise lines whereas Carnival Corporation & plc and Royal Caribbean Cruises Ltd. are considered holding corporations .This industry practice of using the brand, not the larger holding corporation, as the cruise line is also followed in the member cruise lines in Cruise Lines International Association (CLIA) and the member-based reviews of cruise lines.The cruise industry is estimated to be around 45.6 billion with around 26 million passengers annually.