Royal Caribbean International is a cruise line brand founded in Norway and based in Miami, Florida, United States. It is owned by Royal Caribbean Cruises Ltd. As of October 2015[update], the line operated 23 ships, had three additional ships on order, and controlled 17 percent of the cruise market worldwide. All ships under the Royal Caribbean International brand have names ending with "of the Seas" (e.g. Oasis of the Seas) a practice which began in 1991. Sister brands owned by Royal Caribbean Cruises Ltd. are Celebrity Cruises, Azamara Cruises, Pullmantur Cruises and CDF Croisières de France. Royal Caribbean International was founded as Royal Caribbean Cruise Line in 1968 by three Norwegian shipping companies: Anders Wilhelmsen & Company, I.M. Skaugen & Company, and Gotaas Larsen. The newly created line put its first ship, the Song of Norway, into service two years later. A year later, the line added the Nordic Prince to the fleet and in 1972 it added the Sun Viking. In 1978, Song of Norway became Royal Caribbeans first passenger ship to be lengthened. This was accomplished via the insertion of an 85-foot (26 m) section to the vessels severed center. Following the success of this work, Nordic Prince was also stretched in 1980. During the stretching on both ships, their sterns were modified. However the Sun Viking wasn't stretched or modified and remained the same size and shape. Royal Caribbean received widespread global recognition when in 1982 it launched the Song of America, over twice the size of Sun Viking and at the time the third largest passenger vessel afloat (after the Norway and the Queen Elizabeth 2). In 1986, Royal Caribbean leased a coastal property in Haiti which it used as a private destination for its guests. This destination is now called Labadee. After a corporate restructuring in 1988, the line launched Sovereign of the Seas, the largest passenger vessel afloat at the time. Two years later, Nordic Empress and Viking Serenade were also entered into their service line. In the same year, Royal Caribbean purchased a second private destination, Little Stirrup Cay, an island in the Bahamas, which they rechristened "Coco Cay."