All nine people aboard an excursion plane from a Holland America Line cruise ship that crashed in Alaska on Thursday died in the accident, police and the aircraft company said.Eight passengers and the pilot were killed when the plane went down during a tour of the Misty Fjords area of southeast Alaska on Thursday afternoon, flight operator Promech Air said in a statement."There is nothing I can say that can alleviate the pain and overwhelming sense of loss," said Marcus Sessoms, president of Promech Air.