The first public mention of an alleged flight of a Ju 390 to North America appeared in a letter published in the November 1955 issue of the British magazine "RAF Flying Review", of which aviation writer William Green was an editor. The magazine's editors were skeptical of the claim, which asserted that two Ju 390s had made the flight and that it included a one-hour stay over New York City. In March 1956, the Review published a letter from an RAF officer which claimed to clarify the account. According to Green's reporting, in June 1944, Allied Intelligence had learned from prisoner interrogations that a Ju 390 had been delivered in January 1944 to "Fernaufklärungsgruppe" 5, based at Mont-de-Marsan near Bordeaux and that it had completed a 32-hour reconnaissance flight to within of the U.S. coast, north of New York City. This was rejected just after the war by British authorities. Aviation historian Dr. Kenneth P. Werrell states that the story of the flight originated in "General Report on Aircraft Engines and Aircraft Equipment", two British intelligence reports from August 1944, which were based in part on the interrogation of prisoners. The reports claimed that the Ju 390 had taken photographs of the coast of Long Island but no photos or other evidence for the existence of such photos has ever been found.