https:// en.wikipedia.org/wiki/Charles_Dellschau
Despite exhaustive research, including searches of census records, voting rosters, and death records, nothing has been found to substantiate the existence of this group except for a few gravestones in the Columbia Cemetery where several of the surnames are found. It is speculated that, like the voluminous "Realms of the Unreal" notebooks by outsider artist Henry Darger (1882-1973), the Sonora Aero Club is a fiction by Dellschau.[11] However, according to UFO writer Pete Navarro, a coded story is hidden throughout the drawings, which he interprets to mean that the Sonora Aero Club was a branch of a larger secret society known only as NYMZA.