Royal Caribbean International is a Norwegian and American cruise line brand based in Miami, Florida and owned by Royal Caribbean Cruises Ltd.. With 42 ships in service under 5 different brands and several more under construction, it controls a 24% share of the world cruise market. All ships of the their main brand Royal Caribbean Cruise Line have names ending in "of the Seas" since 1991. Sister brands are Celebrity Cruises, Azamara Cruises, Pullmantur and CDF Croisières de France.