UFO sighted by pilots on transpacific flight

Summary

A UFO was sighted by two commercial jet crews during a transpacific flight on September 21, 1961. Pilots reported seeing a luminous ring-shaped object with a dark center and a bright rim, moving at orbital speed and leaving a faint glowing trail. The object was described as a dark ring with a clear center, visibly different from the aurora. The phenomenon was observed for approximately six minutes and no official explanation was provided for its identity.

The pilots, flying at an altitude of 37,000 feet, reported the object suddenly appearing in the sky at an elevation of about 50 degrees. The object did not resemble a missile or satellite, and its size and speed suggest it could have been an unknown space object. Despite investigations, no physical evidence or photographs were found to confirm its nature, keeping the case one of the most intriguing in UFO history.