(Ketchikan, AK) -- Officials say all nine people aboard a sightseeing plane died when the aircraft crashed yesterday afternoon in southeast Alaska. Authorities say the eight passengers aboard the plane had sailed on a cruise ship that departed Seattle earlier this month. Officials with Seattle-based Holland America say the crash happened about 20 miles northeast of Ketchikan. The eight passengers had sailed on the Westerdam, which left Seattle on June 20th.