Dr William W. Christmas had medical practice but is famous-rather, notorious-for aircraft with flexible cantilever wings emulating those of birds. First aircraft allegedly flown September 1907 (burned later to protect secrets). Formed Christmas Aeroplane Co., Washington, 1911, built 2nd aircraft 1911, 3rd 1912. Fourth built by Continental Aircraft at Amityville under contract to Christmas, who later formed 'Cantilever Aero Co.' as subterfuge. Army provided Liberty engine. Called Bullet, or Aero Bullet, shed wings and killed pilot on first take-off 14 January 1919. Second aircraft never flew, fortunately.