UFO seen in Illinois with vapor trail

Summary

An object was observed in Gravville, Illinois, on September 17, 1957. A civilian witness described an object with vapor trails moving from north to south and then west. The observation lasted between 15 and 20 minutes. Although no photos were taken, the report suggests it could be an aircraft due to its path and characteristics. The data is inconclusive, but points to a conventional aerial explanation.

The report mentions that the observer was alerted by a neighbor, indicating the object was visible long enough for multiple people to notice. Despite the duration of the observation, no additional records were found to confirm the object's nature.