RMS Olympic and sold at auction before she was scrapped, and now adorn buildings and a cruise ship. By contrast with "Olympic", the other two ships in the class, "Titanic" and , did not have long service lives. "Titanic" collided with an iceberg in the North Atlantic on her maiden voyage and sank, while "Britannic" struck a mine and sank in the Kea Channel in Greece in 1916. "Britannic" never served her intended role as a passenger ship. Built in Belfast, Ireland, "Olympic" was the first of the three s – the others were and . They were by far the largest
Sister ship an . The most famous sister ships were the White Star Line's , and . As with some other liners, the sisters worked as running mates. Other sister ships include the Royal Caribbean International's and . "Half-sister" refers to a ship of the same class but with some significant differences. One example of half-sisters are the First World War-era British s where the first two ships had four guns, but the last ship, , had two guns instead. Another example is the American s of the Second World War that came in "long-hull" and "short-hull" versions. Notable airships include the