Viking Line is one of the major Finnish shipping companies[?] operating a fleet of large combined ferry/cruise ships between Finland, Åland Islands, Sweden and Estonia. Viking Line traces its roots back to the start of ferry traffic between Sweden, the Åland Islands and Finland. Viking Line AB was formed as a marketing company owned by three of the ferry operators. After Sally Line AB[?] and later Slite AB[?] went out of business due to bad investments the remaining operator SF Line integrated Viking Line and later changed its name to the same.