Viking has separate ships for US and German customers. While all the longships are US only Viking has chartered ships from Lüftner for the German customers. They used to have long time charters from Premicon which included a Viking ship name (like Viking Legend, Viking Primadonna).
Last year they´ve lost a law suit against K-D (Köln-Düsseldorfer). Some 30 years ago Viking bought their river cruise ships and K-D was forced to step back to excursion boats. K-D invented river cruising on the Rhine river.