SEABOURN said last week that it will order two ships for delivery in spring 2009 and 2010. The line signed a letter of intent with shipbuilder T. Mariotti of Genoa, Italy, for an all-in cost of $250 million each. The two 32,000-ton, 450-passenger ships would more than double Seabourn's current capacity of 634 berths. Micky Arison, CEO of parent company Carnival Corp, said in a statement that the luxury cruise market "has shown significant and consistent revenue growth in recent years."