(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.