Black triangular UFO sighted in Japan in 1951

Summary

In January 1951, an observer in Japan reported a black object shaped like a delta wing at an altitude of 40,000 feet. The description is brief and lacks additional details such as speed, noise, or behavior. The report does not specify whether the sighting was visual or radar-based, and no photographs were taken. Despite the precise location, the lack of detailed information made it impossible to evaluate the object conclusively.

The official conclusion was that there was insufficient data to classify the object. The report was sent from Tokyo to the United States, but no follow-up information was received. This case is an example of how many sightings from that era remained unresolved, leaving open questions about their nature.