Hello
Every idea starts out as a vision or dream. A little over ten years of flight aircraft were carrying weapons and bombs. England was bombed from another land. (Zepplins and the Gotha types) It wouldn't be hard to dream/vision about an attack on the Americas . Just givin the right combination it COULD have worked.
As far as damage from this aircraft...probably minimal, but the psychological effect would be the factor. Especially since many Americans thought aircraft were nothing more than a play thing. Some, still at that time, had never seen an airplane.
Be well
chip55