 Cruise lines have a dual character; they are partly in the transportation business, and partly in the leisure entertainment business, a duality that carries down into the ships themselves, which have both a crew headed by the ship's captain, and a hospitality staff headed by the equivalent of a hotel manager.Because of mergers and consolidations, a cruise line may also be a brand of a larger holding corporation.For example, as noted below, Carnival Cruise Line and Holland America Line are cruise lines within the larger parent corporation Carnival Corporation & plc.