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ACUFO is my comprehensive catalog 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.

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Wonsan, North Korea, in 1945:

Case number:



In the years 1990 - 2000, the American Joseph Trainor wrote a ufological news bulletin on the Web, UFO Roundup; in which he sometimes mentioned old cases.

In his December 30, 1999, bulletin, he claimed that in 1945, three Japanese "Zeros" engaged "two daylight discs in a dogfight over Wonsan, North Korea. One Zero is shot down, and the UFOs flee into space."

Trainor gave no source for this brief account.


Temporal data:

Date: 1945
Time: Day.
Duration: ?
First known report date: 1999
Reporting delay: 5 decades.

Geographical data:

Country: North Korea
State/Department: Kangwon
City: Wonsan

Witnesses data:

Number of alleged witnesses: 3
Number of known witnesses: ?
Number of named witnesses: 0

Ufology data:

Reporting channel: Joseph Trainor's UFO roundup.
Visibility conditions: Day.
UFO observed: Yes.
UFO arrival observed: ?
UFO departure observed: Yes.
UFO action: Dogfight, shoots down one of the plane, flee.
Witnesses action: Dogfight.
Photographs: No.
Sketch(s) by witness(es): No.
Sketch(es) approved by witness(es): No.
Witness(es) feelings: ?
Witnesses interpretation: ?


Sensors: [X] Visual: 3
[ ] Airborne radar: N/A
[ ] Directional ground radar:
[ ] Height finder ground radar:
[ ] Photo:
[ ] Film/video:
[ ] EM Effects:
[ ] Failures:
[X] Damages: 1 of 3 planes destroyed.
Hynek: DD
Armed / unarmed: Armed, 2 Type 99 20 mm canons and 2 Type 97 7,62 mm machine guns.
Reliability 1-3: 1
Strangeness 1-3: 3
ACUFO: No credibility.



1945 - Three Japanese Zeroes engage two daylight discs in a dogfight over Wonsan, North Korea. One Zero is shot down, and the UFOs flee into space.



Three Japanese ZERO planes (vog: Japanese fighters and kamikaze planes) engage in broad daylight combat with two air discs above Wonsan in North Korea. One of the ZERO planes is shot down while the disks disappear into space. (A CENTURY OF UFO – UFO Roundup Dec. 1999, ed. Joseph Trainor) (vog note: no plane crash or loss on this date and in this place in the database /database.htm Copyright 1997-2004 Richard Kebabjian)


Date: 1945

Location: Wonsan, North Korea,


Summary: Three Japanese Zeroes engage two daylight discs in a dogfight. One Zero is shot down, and the UFOs flee into space.


Aircraft information:

The Mitsubishi A6M "Zero" (photo below) (Allied codename "Zeke") was a Japanese light carrier-based fighter-bomber used by the Imperial Japanese Navy from 1940 to 1945.

Mitsubishi Zero.



Joseph Trainor generally did not check the reports he published, sometimes just collected on the Web; the more annoying here is that no source is given.

No other ufology source said anything about this alleged event (Belgian "skeptical" ufologist Godelieve van Overmeire merely picked up Trainor's report).


No credibility.

Sources references:

* = Source is available to me.
? = Source I am told about but could not get so far. Help needed.

File history:


Main author: Patrick Gross
Contributors: None
Reviewers: None
Editor: Patrick Gross

Changes history:

Version: Create/changed by: Date: Description:
0.1 Patrick Gross December 6, 2023 Creation, [jtr1], [gvo1], [tai1].
1.0 Patrick Gross December 6, 2023 First published.

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This page was last updated on December 6, 2023.