The claimed flight was mentioned in many books following the "RAF Flying Review" account, including Green's respected "Warplanes of the Second World War" (1968) and "Warplanes of the Third Reich" (1970) but without ever citing reliable sources. Further authors then cited Green's books as their source for the claimed flight. Green told Kenneth P. Werrell many years later that he no longer placed much credence in the flight. Werrell later examined the data regarding the range of the Ju 390 and concluded that although a great circle round trip from France to St. Johns, Newfoundland was possible, adding another for a round trip from St. Johns to Long Island made the flight "most unlikely".