This historical Australian newspaper article contains the keyword "mystery aeroplane": 5 Jan 1924, "THE KLUF KLUX KLOWNS": http://nla.gov.au/nla.news-article210487448
THE KLUF - KLUX KLOWNS - Truth (Perth, WA : 1903 - 1931) - 5 Jan 1924

Captain Chaplin Wilson could be taken seriously in his announcement that he will form a branch of the dreaded America Ku Klux Kish Sydney, then it would be better for Australia generally that the, Captain Chaplain be deported forthwith, For the methods of the ...

Trove