ACUFO:

ACUFO is my comprehensive catalogue of cases of encounters between aircraft and UFOs, whether they are "explained" or "unexplained".

The ACUFO catalog is made of case files with a case number, summary, quantitative information (date, location, number of witnesses...), classifications, all sources mentioning the case with their references, a discussion of the case in order to evaluate its causes, and a history of the changes made to the file.

Click on the links to access the corresponding folder.

Date	Country	Place	Evaluation
1914-1918	France	On France and the frontline.	Phosphorus anti-aircraft shells.
January 31, 1916	U-K.	Near Romford, Essex.	Possible star Capella, insufficient information.
January 31, 1916	U-K.	Near Rochford, Essex.	Uncertain, possible misinterpretation.
1917	Belgium	West of Belgium.	Tabloid invention.
January 9, 1918	France	Near Villers-Bocage.	Urban legend, not UFO-related.
September 1920	Australia	In the Bass Strait.	No strangeness.
January 1926	USA	Between Wichita and Colorado Springs.	High strangeness, unknown credibility.
Late September 1926	USA	In Utah.	Probably invented in 1994.
1931	U-K.	In England.	Totally insufficient information.
June 6, 1931	Australia	Over the Tasman Sea.	Possible extraterrestrial craft, or mirage.
1932	Greenland (Denmark)	East coast of Greenland.	Possible extraterrestrial craft.
July 5, 1933	U-K.	In the Sussex.	Probably invented in 1994.
October 19, 1934	Australia	Victorian coast.	Not UFO-related.
1935	U-K.	Near Edinburgh in Scotland.	Not UFO-related.
October 10, 1936	Italy	Over Formiche di Grosseto.	Probable meteor.
1 janvier 1937	USA	In Virginie.	Possible extraterrestrial craft, lack of information.
1937	USA	Near Van Buren, Missouri.	Totally insufficient information.
Between 1937 and 1945	China or Japan	China or Japan.	Probable sun reflection on planes.
Between 1937 and 1945	China or Japan	China or Japan.	Stains on photograph.
1938	Russia	Near Moscow.	Possible invention, unknown credibility.
Between 1938 and 1945	China or Japan	China or Japan.	No credibility, probably not UFOs.
End of the Summer 1939	USA	San Diego.	Probable invented story.
Between 1940 and 1945	Japan	In Japan or the occupied Pacific.	Probable photo artefact.
Between 1940 and 1945	Japan	In Japan or the occupied Pacific.	Probable photo artefact.
1940	Denmark	On the coast.	Insufficient information, unknown credibility.
March 23, 1940	Germany	Cuxhaven.	Insufficient information, possible meteor.
March 24, 1940	Germany	Wesermünde.	Possible extraterrestrial craft.
1941	Germany	Over Germany.	Probable invention od sensation publication.
January 1941	China	In Manchuria.	Totally insufficient information and credibility.
After June 1941	Russia	On an airfield.	Extraterrestrial craft or invention.
1942	Greenland (Denmark)	Near Thule.	Totally insufficient information.
March 14, 1942	Norway	Near the Banak military airfield.	High strangeness, unknown credibility.
March 25, 1942	Holland	Over the Zuiderzee.	Possible extraterrestrial craft.
May 17, 1942	Germany	Onasbr ck, Germany.	Possible meteor.
August 1942	Australia	In the Bass Strait.	Possible extraterrestrial craft, unknown credibility.
August 11, 1942	Germany, Belgium	Near Aachen and Verviers.	Unidentified, possible mix of different events.
September 1942	Japan	In the Sea of Japan.	Probable photo fault, no credibility.
November 1942	France	Bay of Biscay.	Unknown credibility.
November 28, 1942	Italy	In the area of Turin.	Possible extraterrestrial craft.
December 9, 1942	France	The Somme estuary.	Possible extraterrestrial craft.
December 10, 1942	France	The Somme estuary.	Possible extraterrestrial craft.
Between 1942 and 1943		In Belgium or Holland.	Insufficient information.
1943	U-K.	Over the English Channel.	Possible invention.
1943	Japan	On the Devil's Sea.	No credibility, probably not UFOs.
1943	Burma	Burma.	Without credibility.
1943	USA	Arizona.	Without credibility.
1943		Atlantic Ocean between USA and U-K.	Possible extraterrestrial craft, uncertain reliability.
1943	Germany	Over Germany.	Sensation author invention.
January 5, 1943	Germany	Over Kiel.	Insufficient information.
January 15, 1943	France	Over Cherbourg.	Probable German flak.
March or April 1943	Tunisia	Near Monastir.	Possible extraterrestrial craft.
March 13, 1943	Italy	Near Naples.	Possible red Moon.
April 5, 1943	USA	Long Beach.	Possible extraterrestrial craft.
April or May 1943	France or Germany	Above France or Germany.	Possible parachutes.
May 1943	France	Over the English Channel.	Unidentified.
May 12, 1943	Germany	Duisburg.	Probable meteor.
May 13, 1943	Germany	Dortmund.	Probable meteor.
May 13, 1943	Czech Republic	Pilsen.	Probable meteor.
May 27, 1943	Germany	Essen.	Possible engin extraterrestre.
June 8, 1943	France	Somewhere over France.	Possible extraterrestrial craft, unknown credibility.
June 26, 1943	Germany	Elbe estuary.	Unidentified, totally insufficient information.
July 1943	USA	Near Minneapolis.	Possible meteor.
July 26, 1943	USA	The Aleutian islands.	Radar echoes of Flocks of birds.
Autumn 1943	Germany	Peenem nde.	Possible extraterrestrial craft.
September 1943	France	In France.	Insufficient information.
September 1943	Russia	Pushkino.	Insufficient information.
September 6, 1943	Germany	Stuttgart area.	Possible fire bomb debris.
October 14, 1943	Germany	Above Schweinfurt.	Unidentified.
November 26, 1943	Germany	Over Bremen.	Unidentified, possible flares.
December 11, 1943	Germany	Emden.	Probable Messerschmitt Me-163 "Komet".
December 14, 1943	Italy	Naples area.	Possible extraterrestrial craft.
December 18, 1943	Germany	Hamburg and other cities.	Invention by author Henry Durrant.
End of 1943	Germany	Center of Germany.	Possible extraterrestrial craft, problem in the report.
End of 1943	Germany	Bremen.	Possible extraterrestrial craft.
Between 1941 and 1945		Over Europe	No strangeness.
Between 1941 and 1945		In Europe	Probable invention by Website.
1944		In France or Germany	High strangeness, insufficient information.
1944		The Rhine valley	Insufficient information.
1944	USA	Los Angeles	Totally insufficient information.
1944	USA	West Virginia	Probable late invention.
1944	Ukraine	On the Southwest of Ukraine.	Possible extraterrestrial craft or invention.
1944	India	Over India.	Invention.
1944		South Atlantic ocean.	Possible extraterrestrial visitors, unknown credibility.
1944	Romania	Ploesti.	Insufficient information, unknown credibility.
About 1944	Germany	Near Berlin.	Unknown credibility.
January 3, 1944	Germany	Near Halberstadt.	Unidentified.
January 5, 1944	Germany	Over Kiel.	Possible Me-163's, insufficient information.
January 27, 1944	Germany	Near Berlin.	Possible extraterrestrial craft.
January 28, 1944	France	Probably over the South of France.	Insufficient information.
February 1944	Australia	Bass Strait.	Possible extraterrestrial craft, possible invention.
February 3, 1944	Germany	In Germany.	Unidentified.
February 4, 1944	Holland	Dutch coast.	Probable flak.
February 4, 1944	Germany	Over Francfort.	Probable weather balloon.
February 8, 1944	Germany	Over Francfort.	Probable weather balloon.
February 19, 1944	Germany	Over Aachen.	Possible extraterrestrial craft.
February 19, 1944	Germany	Koblenz.	Possible extraterrestrial craft.
February 19, 1944	Germany	Leipzig.	Totally insufficient information.
February 25, 1944	France	Saint-Quentin.	Possible German barrage balloons.
March 1944	USA	Near Yakima.	Probable invention by UFO magazine.
March 1, 1944	USA	Carlsbad.	Probable meteor.
April 11, 1944	Germany	Over Germany.	Possible plane on flames, insufficient information.
April 25, 1944	France	Over France.	Unidentified, insufficient information.
April 26, 1944	France	Above Essen.	Possible extraterrestrial craft.
April 30, 1944	France	Near Anzio.	Possible extraterrestrial craft.
May 1944	Austria	Over Austria.	Totally insufficient an doubtful information.
May 1944	France	The English Channel.	Totally insufficient information, unknown credibility.
June 1944	Italy	Near Bari.	Insufficient information, unknown credibility.
June 1944	USA	In Los Alamos.	Insufficient information, unknown credibility.
June 1944	Italy	Over Firenze.	Possible extraterrestrial craft, insufficient information.
June 1944	Micronesia	In the Marshall islands.	Possible cloud radar echo.
June 6, 1944	France	In Normandy.	Possible German fighter plane, unknown credibility.
July 15, 1944	USA	North of Tampa.	Possible invention.
July 25, 1944	Germany	Near Stuttgart.	Extraterrestrial craft or searchlights.
Summer 1944	Italy	In Italy.	Totally insufficient information.
August 1, 1944	Romania	Over Ploesti.	Totally insufficient information, possible meteor.
August 10, 1944	Indonesia	Palembang, Sumatra.	Possible extraterrestrial craft.
August 10, 1944	Indonesia	Palembang, Sumatra.	Possibles ground-to-air rockets.
August 10, 1944	Japan	Nagasaki.	Insufficient information, possible meteor.
August 11, 1944	France	Over France.	Insufficient information.
August 12, 1944	France	Back from La Pallice.	Possible extraterrestrial craft.
August 13, 1944	Indonesia	Kaoe Bay.	Negative case, probable flare.
August 18, 1944	Italy	Near Alfonsine.	Probable radar chaff.
September 1944	Burma	Over Burma.	Insufficient credibility.
September 1944	Germany	Over Germany.	Possible extraterrestrial craft.
September 1944	Germany	Over Germany.	Insufficient information.
September 9, 1944		Over France or Germany.	Insufficient information, unknown credibility.
September 18, 1944	USA	Mount Deception.	Not UFO-related.
September 20, 1944	Italy	In the Po valley.	No strangeness.
September 20, 1944	Italy	Near Florence.	No strangeness, possible flares.
September 29, 1944	Germany	Rechlin-Roggentin.	Invention by author.
Autumn 1944	Germany	Ovre Germany.	Possible extraterrestrial craft.
October 1944	Germany	In the Rhine valley.	Possible extraterrestrial craft.
October 3, 1944	Germany	Somewhere in Germany.	Unidentified.
October 12, 1944	France	Near Strasbourg.	Unexplained, not necessarily related to UFOs.
October 13, 1944	Hungary	Nears Székesfehérvár.	Uncorroborated information.
October 25, 1944	Japan	Near Omura.	Possible balloon.
October 25, 1944	Japan	Near Omura.	Possible balloon.
October 25, 1944	Japan	Near Omura.	Possible balloons.
October 30, 1944	Germany	Over Cologne.	Insufficient information.
October 30, 1944	Germany	Near Munich.	Possible meteor or ball lightning.
November 1944	Poland	Near Warsaw.	Possible extraterretrial craft, ubknown credibility.
November 1944	Germany	Over Germany.	Unidentified, insufficient information.
November 11, 1944	Malaisia	Singapour.	Possible plane or meteor.
November 5, 1944	Germany	Near Aachen.	Unidentified.
November 10, 1944	Japan	Okayama.	Possible misinterpretation.
November 22, 1944	Germany	Coblence.	Probable German jet planes.
November 22, 1944	Norway	West-South-West of Trondheim.	Possible extraterrestrial craft.
November 23, 1944	Belgium	At Huldenberg.	Explained, not UFO-related.
November 24, 1944	Austria, Italy	Klagenfurt, Trieste.	Possible extraterrestrial craft.
November 26, 1944	Germany	Between Mannheim and Longvic.	Insufficient information.
November 28, 1944	Germany	Cologne.	Probable Me-262 jet planes.
December 1944	France or Germany	Between Strasbourg and Mannheim.	totally insufficient information.
December 1944		Over Europe or in the Pacific.	Possible extraterrestrial craft, insufficient information.
December 1944	France or Germany	East of France or West of Germany.	Totally insufficient information.
December 1944	Germany	In Germany.	Totally insufficient information.
December 1944	Germany	Near Frankfurt.	Possible extraterrestrial craft.
December 1, 1944	Germany	Over Oberhausen.	Unexplained, insufficient information.
December 2, 1944	Italy	Near Ghedi and Villafranca di Verona.	Low strangeness or no strangeness.
December 4, 1944	Germany	Over Bochum.	Unexplained, insufficient information.
December 5, 1944	Germany	Rhine valley.	Possible German plane.
December 14, 1944	France	Towards Erstein.	Unidentified, low strangeness.
December 17, 1944	Germany	Near Lichtenau.	Insufficient information, possible ground targets.
December 17, 1944	Germany	Near Neufreistett.	Insufficient information, probable ground targets.
December 17, 1944	Germany	Near Karlsruhe.	Low strangeness.
December 17, 1944	Germany	On Rastatt.	Unidentified, moderate strangeness.
December 22, 1944		France or Germany.	Low strangeness, probable enemy plane.
December 23, 1944	USA	Between Blackstone and Richmond.	Possible meteor, possible extraterrestrial craft.
December 23, 1944	France	Near Sarrebourg.	Possible plane.
December 24, 1944	Germany	Near Karlsruhe.	Possible extraterrestrial craft.
December 24, 1944	France or Germany	Over the Rhine Valley.	Probable German V-2 rocket.
December 26, 1944	Germany	Near Worms.	Possible extraterrestrial craft.
December 26, 1944	Germany	Near Worms.	Totally insufficient information.
December 27, 1944	France	8 miles Northeast of Lunéville.	Possible extraterrestrial craft.
December 27, 1944	France	Over France.	Totally insufficient information, possible flares.
December 27, 1944		Over the Rhine Valley.	Unidentified, possible extraterrestrial craft.
December 28, 1944	Belgium	Over the Ardennes.	Probable V-2 rocket launch.
December 28, 1944	Germany	Over Trier.	Unidentified, insufficient information.
December 28, 1944	Germany	On the Rhine valley.	Possible extraterrestrial craft.
December 30, 1944	France	Near the Ochey airfield.	Insufficient information.
Winter 1944-1945	Germany	West of Neustadt.	Possible weather balloon.
Winter 1944-1945	Germany	Southwestern Germany.	Insufficient information.
Winter 1944-1945	France or Germany	Rhine valley.	Insufficient information.
1944-1945		China or Burma or India.	Insufficient information.
1944-1945		Over Europe.	Modern photographic hoax.
1944-1945	Japan or China	Japan or China or the Pacific Ocean.	Probable reflection on cockpit.
1944-1945	Germany	Over Germany.	Possible extraterrestrial craft, sparse information.
1945	Germany	Towards Munster.	Totally insufficient information.
1945	France or U-K.	The English Channel.	Totally insufficient information.
1945	Japan	Over Honshu.	Unknown crrdibility.
1945	North Korea	In Wonsan.	Without credibility.
1945	Taiwan	On Taiwan.	Insufficient information, possible flares.
Before August 1945	Japan	From Tinian.	Possible extraterrestrial craft.
January 1945		Above the English Channel.	Possible German rocket plane or jet plane.
January 1, 1945	Germany	In Germany.	Possible extraterrestrial craft, possible double-entry.
January 1, 1945	France	Near the Ochey base.	Insufficient information.
January 1, 1945	Holland	On the Zuiderzee.	Possible extraterrestrial craft.
January 2, 1945	Allemagne	Over Germany.	Possible enemy night fighter plane.
January 10, 1945	France	Towards Ingwiller.	Possible German V-2 rocket.
January 10, 1945	Japan	Iwo Jima.	Low strangeness, possible meteor.
January 12, 1945	France	In Dijon.	Distorted story by "nazi saucers" promoter.
January 30, 1945	France or Germany	Between Wissembourg and Landau.	Unidentified.
February 2, 1945	France	In Colmar.	Possible meteor.
February 7, 1945	Japan	On Ulithi Atoll.	Possible extraterrestrial craft.
February 8, 1945	France	Between Breisach and Strasbourg.	Probable German V-2 rocket.
February 9, 1945	Germany	On Riegel.	Possible flare or parachute flare.
February 10, 1945	Italy	Florence.	Insufficient information, no strangeness reported.
February 14, 1945	France	Bettendorf.	Unexplained.
February 14, 1945	France	Over Landau.	No reported strangeness.
Mid-February 1945	USA	Near Deming or Columbus, New Mexico.	Possible extraterrestrial craft.
Mid-February 1945	Germany	On Chemnitz.	Possible Messerchmitt Me-163 "Komet".
February 16, 1945	Italy	Near Pisa.	Probable flares, one enemy plane.
February 16, 1945	Italy	La Spezia.	Possible extraterrestrial craft.
February 17, 1945	Italy	West of Massa.	Insufficient information.
February 17, 1945	Italy	Po Valley.	No reported strangeness, possible planes.
February 17, 1945	Italy	Po Valley.	Insufficient information.
February 18, 1945	Italy	Near Mantova.	Possible flares.
February 21, 1945	Italy	On Piacenza.	Insufficient information.
February 22, 1945	Italy	Near Parma.	Possible flare.
February 21, 1945	Italy	From the Massa area.	Probable flares and/or fires.
February 22, 1945	Italy	In the central Po Valley.	No reported strangeness.
February 22, 1945	Japan	Near Chichi Jima.	Possible extraterrestrial craft.
February 27, 1945	Italy	Near Bologna.	Possible false radar echo and enemy plane.
February 27, 1945	Italy	Near Bologna.	Insufficient information.
March 1945	Italy	Over the Friuli.	Insufficient information.
March 1945	Austria	On the Brenner Pass.	Unknown credibility.
March 1945	Italy	.	Possible extraterrestrial craft.
March 3, 1945	Germany or Holland	Over the North Sea.	Insufficient information, possible balloons.
March 5, 1945	Germany or Holland	Germany of Holland.	Insufficient information, possible V-2 rocket.
March 13, 1945	Italy	Near Bologna.	Unidentified.
March 13, 1945	Italy	Near Bologna.	Unidentified, moderate strangeness.
March 13, 1945	Japon	On Osaka.	Possible extraterrestrial craft.
March 14, 1945	France	Near Hagenau.	Insufficient information, moderate strangeness.
March 18, 1945	Italy	Near Florence.	Possible extraterrestrial craft.
March 20, 1945	Germany	Near Speyer.	Unidentified, possible extraterrestrial craft.
March 23, 1945	Italy	Near Bergamo.	Unidentified, insufficient information.
March 26, 1945	Germany	The Ruhr valley.	Possible extraterrestrial craft, insufficient information.
March 26, 1945	Japan	On Iwo Jima.	Possible extraterrestrial craft.
March 26, 1945	Germany	Over Worms.	Low strangeness, possible V-2 rocket.
March 27, 1945	Japan	On Iwo Jima.	Insufficient information.
April 1945	Austria	Over Linz.	Possible extraterrestrial craft, meager information.
April or May 1945	Germany	In Germany.	Unidentified, insufficient information.
April 3, 1945	Japan	Tokyo Bay.	Probable enemy plane with searchlight.
April 3, 1945	Japan	Kawasaki.	Insufficient information.
April 3, 1945	Japan	Over Japan.	Insufficient information.
April 4, 1945	Japan	Tokyo Bay.	Possible extraterrestrial craft, or Jupiter.
April 7, 1945		Over the North Sea.	Possible extraterrestrial craft.
April 7, 1945	Japan	Nagoya.	Insufficient information.
April 18, 1945	Japan	Iwo Jima.	Possible enemy plane.
April 18, 1945	Japan	Iwo Jima.	Possible enemy planes.
April 19, 1945	Sweden	Off Kristiansund.	Possible extraterrestrial craft.
April 24, 1945	France	Near Wissembourg.	No strangeness, probable lights on the ground.
April 25, 1945	Germany	Over Kaiserslautern.	Possible extraterrestrial craft.
Spring 1945	Sweden	Center of Sweden.	Possible extraterrestrial craft.
May 3, 1945	Micronesia	From Truk Atoll to Guam.	Possible extraterrestrial craft.
May 4, 1945	Denmark	In the Jutland.	Probable late invention on the Web.
May 17, 1945	Japan	South of Nagoya.	Possible extraterrestrial craft.
May 17, 1945	Japan	South of Nagoya.	Moderate strangeness, possible enemy plane
May 17, 1945	Japan	South of Nagoya.	Low strngeness, possible enemy plane.
May 17, 1945	Japan	South of Nagoya.	Possible extraterrestrial craft.
May 17, 1945	Japan	South of Nagoya.	Probables air to air rockets.
May 17, 1945	Japan	South of Nagoya.	Moderate strangeness.
May 17, 1945	Japan	South of Nagoya.	Unidentified.
May 17, 1945	Japan	South of Nagoya.	Unidentified.
May 17, 1945	Japan	South of Nagoya.	Unidentified, insufficient information.
May 20, 1945	Japan	Over Toyohashi.	Possible extraterrestrial craft.
May 23, 1945	Japan	Over Tokyo.	Totally insufficient information.
May 23, 1945	Japan	Over Tokyo.	Negative case, Venus.
May 25, 1945		On the Atlantic Ocean.	Possible extraterrestrial craft.
May 25, 1945	Japon	Tokyo area.	Possible extraterrestrial craft or enemy plane.
May 27, 1945	Japan	Over Japan.	Possible air-to-air phosphorus bombs.
May or June 1945	Japan	East of Okinawa.	Possible extraterrestrial craft, unknown credibility.
June 1945	Japan	Over Japan.	Insufficient information.
June 1945	Japan	Over Japan.	Possible extraterrestrial craft.
June 1, 1945	Germany or Holland	Over Germany or Holland.	Possible extraterrestrial craft, unknown credibility.
June 5, 1945	Japan	On Kobe.	Possible extraterrestrial craft.
June 9, 1945	Japan	Sur Nagoya.	Possible extraterrestrial craft, insufficient information.
June 18, 1945	Japan	Over Japan.	Insufficient information, possible Jupiter.
June 19, 1945	Japan	Over Japan.	Possible enemi plabe with searchlight.
June 19, 1945	Japan	Over Fukuoka.	Possible air-to-air phosphorus bomb.
1945	Japan	Near Mount Fuji.	Possible extraterrestrial craft.
Summer 1945	India	In India.	Unknown credibility.
July 1, 1945	Japon	Near Osaka.	Possible extraterrestrial craft.
July 2, 1945	Japan	Over Honshu.	Possible extraterrestrial craft, moderate strangeness.
July 4, 1945	Japan	Over Yokohama.	Possible extraterrestrial craft, insufficient information.
July 7, 1945	Japan	Enroute to Sasebo.	Possible extraterrestrial craft or enemy plane.
July 13, 1945	Japan	On Kawasaki.	Possible enemy plane with searchlight.
July 15, 1945	USA	In the Bahamas.	Probably not UFO-related.
July 17, 1945	Japan	Near Numazu.	Unidentified.
July 17, 1945	Japan	Near Numazu.	Unidentified.
July 17, 1945	Japan	On Oita.	Possible extraterrestrial craft, moderate strangeness.
July 19, 1945	Japon	Near Fukui.	Possible enemy plane with searchlight.
August 1, 1945	Japan	Okinawa.	Possible extraterrestrial craft, insufficient information.
August 28, 1945	Japan	Between Ie Jima and Iwo Jima.	Possible extraterrestrial craft.
September 1945 or 1946		In the South Pacific.	Probable Wikipedia contributor invention.
September 10, 1945	USA	Over Lake Fields.	Unknown credibility.

This page was last updated on May 1, 2024.