From 1912 to 1914, Hamburg America Line accomplished a trio of liners significantly larger than the White Star Line's Olympic-class ships. The Hamburg America Line's trio (Imperator, Vaterland, and Bismarck) had been divided between the Cunard Line, White Star Line, and the United States Traces, whereas the three surviving ships of the Kaiser class have been requisitioned by the US Navy within the context of the conflict after which retained. In 1900, the Hamburg America Line competed with its own 4-funnel liner, SS Deutschland. A proposed and planned ocean liner, the Titanic II, is a modern replica of the unique RMS Titanic, which sank in 1912. The ship is owned by Blue Star Line and is bought by Australian businessman Clive Palmer. Cunard's transatlantic liner, Queen Elizabeth 2, though designed as an ocean liner, was additionally used as a cruise ship. By the first decade of the 21st century, only a few former ocean liners have been still in existence. In 1953, the De Havilland Comet grew to become the primary industrial jet airliner; the Sud Aviation Caravelle, Boeing 707 and Douglas DC-8 followed, and far lengthy-distance travel was completed by air. Nationwide Prohibition Act made American liners alcohol-free, inflicting alcohol-searching for passengers to choose ships of different nations for travel and substantially cut back earnings for the United States Lines.