Carnival plc operates as a leisure travel and cruise company in North America, Europe, Australia, and Asia. It offers cruises under the Carnival Cruise Line, Princess Cruises, Holland America Line, and Seabourn brands in North America; and Costa, AIDA, P&O Cruises (UK), Cunard, and P&O Cruises (Australia) brands in Europe, Australia, and Asia. The company operates 99 cruise ships. It also owns Holland America Princess Alaska Tours, a tour company in Alaska and the Canadian Yukon, which owns and operates 11 hotels or lodges, approximately 300 motor coaches, and 20 glass-domed railcars. In addition, the company is involved in the leasing of cruise ships. It sells its cruises primarily through travel agents and tour operators. Carnival plc was founded in 1850 and is headquartered in Southampton, the United Kingdom. Carnival plc operates as a subsidiary of Carnival Corporation & Plc.