Japan Airlines Flight 1628 — Alaskan airspace, 17 November 1986

On 17 November 1986, the crew of Japan Airlines Flight 1628 — a Boeing 747 freighter — reported a sustained 50-minute encounter with multiple unidentified objects over eastern Alaska, with corroborating radar contacts at Anchorage Air Route Traffic Control. The FAA's contemporaneous investigation file was released; Captain Kenju Terauchi's account remains one of the most-detailed civil aviation UAP reports.

On the evening of 17 November 1986, Japan Airlines Flight 1628 — a Boeing 747-200F cargo aircraft transiting from Reykjavik to Anchorage as part of a Paris-to-Tokyo cargo service — encountered what its three-person crew described as multiple unidentified objects over eastern Alaska, near the town of Fort Yukon. The encounter lasted approximately 50 minutes and was documented in real time on the cockpit voice recorder and via radio contact with Anchorage Air Route Traffic Control Center.

What is on the record

• Captain Kenju Terauchi’s detailed written statement to FAA investigators (December 1986), released to the public through Freedom of Information Act requests in 1987.
• The FAA Office of Investigations case file, which became one of the largest UAP-related FAA dossiers in the agency’s history.
• Anchorage ARTCC radar tapes, on which intermittent unidentified contacts were recorded in the vicinity of JAL 1628.
• A separate radar return reportedly captured by Elmendorf Air Force Base.
• Statements decades later by John Callahan, the former FAA Division Chief of the Accidents and Investigations Branch, who has stated publicly that the FAA’s internal disposition of the case involved briefings to CIA and other agencies.

What the crew reported

Terauchi described two small craft initially, then a much larger object — described as “a walnut shape” or “Saturn-like” — at extreme size relative to his aircraft. The encounter included:

• Visual observation of multiple lighted objects accompanying the aircraft.
• Air-to-ground radio confirmation of unidentified contacts on Anchorage ARTCC radar.
• Course and altitude maneuvers attempted by the JAL crew in response to the contacts.
• Contemporaneous radio exchange with Anchorage controllers, all preserved on tape.

Mundane explanations considered

1. Misidentified celestial bodies. Jupiter and Mars were both above the horizon at the time and unusually bright; some skeptical analyses (notably Philip Klass and astronomers consulted by the FAA) attributed the visual portion to planetary observation in turbulent atmospheric conditions.
2. Radar return from ice crystals or atmospheric anomaly. Possible for some Anchorage ARTCC returns; the simultaneity with the visual contacts has been debated.
3. Reflection of aircraft lights on cloud or ice layer. Investigated; geometry imperfect.
4. Misidentified aircraft. No flight plan in the area for the period accounts for the contacts.

Open questions

• The full disposition of the FAA’s internal investigation, including any inter-agency briefings.
• Why no parallel ICAO international investigation occurred despite a foreign-flag carrier being involved.
• The reliability of memory-reconstruction in the Captain’s later statements relative to the immediate cockpit recording.

The Council’s verdict

Inconclusive. JAL 1628 is among the more substantial commercial-aviation UAP cases in the public record, with the rare combination of an extended duration, professional aircrew, official investigation, real-time radio documentation, and parallel ground-radar references. The Klass-led skeptical reading of Jupiter-as-source is plausible for portions of the visual account but is contested by other analysts and does not address the radar contacts or the duration. The Council does not assign Confirmed without recovered physical evidence; we do not Debunk because the planetary explanation is not comprehensive.

For aviators and observers in Alaska, the Council’s standing recommendations are the Vortex Diamondback HD 10×42 handheld binocular for in-flight observation and the SiOnyx Aurora Pro for low-light high-latitude documentation.