(NE Atlantic) (Azores), [ILLEGIBLE]Date unknown

On September 26, 1952, a C-124 transport plane flying from Newfoundland to the Azores encountered two distinct green lights while cruising at 6,000 feet in clear weather. The lights appeared about 15 degrees forward of the right wing and slightly above the aircraft. The pilot, co-pilot, engineer, and aircraft commander all witnessed the objects. The lights seemed to alternate positions, staying off the right wing, and at one point appeared to turn toward the plane. They remained visible until the C-124 sighted the Azores Islands.

Air Force investigators checked all other known aircraft in the area by radio and confirmed none were close enough to be the source. Surface vessels were also ruled out, as none operated in that region. The weather was clear with excellent visibility, so atmospheric conditions did not explain the sighting.

The official investigation concluded that the lights were either another aircraft or some kind of light phenomenon. The possibility of another aircraft was considered unlikely because no planes landed after the C-124 at the Azores, and very few aircraft overfly the islands. Any unfriendly aircraft in the area was also deemed doubtful. The investigation noted that a reflection from the aircraft's own green wing light bouncing off a temperature inversion layer (a boundary between layers of air at different temperatures) was theoretically possible but that no data existed to support this explanation. The Air Force evaluation remained "unknown."

The full case file is reproduced below as held by the National Archives across 13 pages of microfilm.