Local authorities confirmed the death toll following a midair collision has risen to six, including four Americans, one Australian and one Canadian.
Ten additional guests on the planes survived the accident and received medical attention.
The accident occurred when two floatplanes collided in midair on Monday, about eight nautical miles from Ketchikan. Both planes were carrying Princess Cruises guests from the Royal Princess cruise ship.
Princess Cruises expressed their regret via Twitter.
Royal Princess is sailing a 'Voyage of the Glaciers' cruise that departed Vancouver, BC, on May 11 and is scheduled to arrive in Whitter on May 18.