In 1987, Adison sold 20% of his shares of Carnival Cruise Lines and immediately generated over 400 million for further expension. In 1988, Carnival acquired the Holland America Line, which had four cruise ships with 4500 berths. Holland America was positioned to appeal to higher-income travelers with cruise prices averaging 25%-35% more than similar Carnival Cruises. The deal included two Holland America subsidiaries, Windstar Sail Cruises and Holland America Westours. This purchase allowed Carnival to begin an aggressive "superliner" building campaign for its core subsidiary. By 1989, the cruise segments of carnival Corporatation carried more than 75000 passengers in one year, a first in the cruise industry.