The Oionus I was a tetrahedral triplane built for Alexander Graham Bell It was the culmination of Bell's experiments with kites built at Baddeck, Nova Scotia. The aircraft's design combined those of the Aerial Experiment Association (AEA)'s AEA Silver Dart biplane and his AEA Cygnet kite. It was Bell's final aviation pursuit and Canada's first and only triplane design. The aircraft attempted a test flight in March 1910, but failed to achieve flight.