Which aircraft on the horizon would most alarm a sailor in a hypothetical 1920s naval war?
Short answerA Blackburn Blackburn or Avro Bison, because either could indicate that a carrier-supported fleet was close.
NotesA Blackburn Blackburn or Avro Bison was not merely an isolated aircraft threat. Its fleet-spotting role meant that a carrier and a substantial surface force were likely operating over the horizon.