How FAA Radar Data Shaped the JAL 1628 Case

Introduction

The radar evidence linked to Japan Air Lines Flight 1628 is the reason the 1986 Alaska sighting became more than a routine pilot UFO report. Captain Kenju Terauchi’s crew described unusual lights pacing their Boeing 747 over eastern Alaska, but the real controversy began when air-traffic controllers, FAA analysts and military radar operators tried to determine whether the objects also appeared on radar systems. The resulting technical reviews produced a confusing picture: some controllers initially believed there were unexplained returns near the aircraft, while later FAA analysis concluded that the radar data did not confirm a separate object. That tension between immediate operational impressions and later technical reassessment still defines the case. [Wikipedia]WikipediaJapan Air Lines Cargo Flight 1628Japan Air Lines Cargo Flight 1628 [UPI]upi.comRadar review fails to confirm UFOUPIRadar review fails to confirm UFO - UPI Archives8 Jan 1987 — Federal investigators said a review of radar tapes failed to show a UFO s…

Within Alaska’s UFO history, the JAL 1628 incident stands out because unusually large amounts of official material survived. Radar plots, transcripts, memoranda and FAA review documents allow researchers to examine how aviation authorities interpreted ambiguous radar contacts in real time and after the event. The radar analysis itself became as important as the sighting.

How the FAA Collected the Radar Evidence

When the JAL crew began reporting unknown traffic on 17 November 1986, Anchorage Air Route Traffic Control Centre treated the situation as a possible aviation hazard rather than a paranormal event. Controllers recorded pilot communications, tracked the aircraft through long-range radar systems and coordinated with military facilities. [The Black Vault Documents]documents.theblackvault.comThe Black Vault DocumentsJL1628Japan Airlines Flight 1628 on November 18, 1986. Radar data recorded by Anchorage Center does not confirm…Published: November 18, 1986

The FAA later assembled several categories of evidence:

• Air-traffic control voice transcripts [reddit.com]reddit.comthe ufo encounter so disturbing the cia buried itThe UFO Encounter So Disturbing, the CIA Buried It for 30…TIL Japan Airlines Flight 1628 over Alaska had a 42 minute long UFO encounte…
• Radar scope observations from controllers [* Primary radar returns]centerforinquiry.s3.amazonaws.comCenter for Inquiry Special ReportsCenter for InquirySpecial ReportsMarch 19, 2019 — This analysis showed that the sporadic second blip was due to a phenomenon known as "un…Published: March 19, 2019 [* Secondary radar beacon data]documents.theblackvault.comThe Black Vault DocumentsJL1628Japan Airlines Flight 1628 on November 18, 1986. Radar data recorded by Anchorage Center does not confirm…Published: November 18, 1986
• Controller statements and shift logs
• Technical evaluations from FAA specialists

This distinction between primary and secondary radar became central to later arguments about what the systems actually detected.

Primary versus secondary radar returns

Primary radar works by bouncing radio energy off a physical object and detecting the reflection. Secondary radar relies on aircraft transponders replying to interrogation signals with identification and altitude information.

Flight 1628 naturally appeared clearly on secondary radar because its transponder was operating normally. The controversy centred on intermittent primary returns that some operators believed indicated another object near the aircraft. [Center for Inquiry]centerforinquiry.s3.amazonaws.comCenter for Inquiry Special ReportsCenter for InquirySpecial ReportsMarch 19, 2019 — This analysis showed that the sporadic second blip was due to a phenomenon known as "un…Published: March 19, 2019

The key difficulty was inconsistency. The alleged extra returns appeared only briefly and irregularly. They did not behave like a continuously tracked aircraft target moving through controlled airspace. That inconsistency later became the FAA’s main reason for rejecting the idea that radar had conclusively tracked a structured unknown craft.

What Controllers Thought They Saw in Real Time

One reason the case gained attention is that some controllers initially believed the radar data supported the pilots’ reports. Contemporary press coverage quoted Anchorage controller John W. Lindley saying radar showed traffic near the aircraft during part of the encounter. [UPI]upi.comController confirms UFO sightingUPIController confirms UFO sighting - UPI Archives30 Dec 1986 — An air controller said radar showed a mysterious object following a Japan…

The timing mattered. Controllers were not reviewing the event calmly after the fact; they were responding live while hearing a professional international cargo crew report nearby objects. Under those circumstances, even intermittent returns carried operational significance.

FAA transcripts show controllers asking nearby military and civilian aircraft whether they could see traffic near the Japanese freighter. Neither a United Airlines flight nor a military C-130 reported visual confirmation or radar contact with unidentified objects. [Wikipedia]WikipediaJapan AirlinesJapan AirlinesJapan Airlines (JAL) is a major Japanese airline headquartered in Shinagawa, Tokyo. The airline's main hubs are Tokyo's…

[That split between:]reddit.comthe ufo encounter so disturbing the cia buried itThe UFO Encounter So Disturbing, the CIA Buried It for 30…TIL Japan Airlines Flight 1628 over Alaska had a 42 minute long UFO encounte…

became one of the most important contradictions in the entire investigation.

The “traffic at eleven o’clock” problem

Part of the confusion came from the ordinary language used in air-traffic control. Controllers sometimes referred to possible “traffic” before confirming exactly what the radar represented. In a live aviation environment, controllers often investigate uncertain returns cautiously because safety takes priority over certainty.

Later UFO retellings sometimes presented these preliminary observations as definitive FAA confirmation. The actual records are more tentative. Controllers discussed possible targets, but the later technical review argued those returns could be explained without invoking an unknown craft. [UPI]upi.comRadar review fails to confirm UFOUPIRadar review fails to confirm UFO - UPI Archives8 Jan 1987 — Federal investigators said a review of radar tapes failed to show a UFO s…

The FAA Technical Review and the “Split Image” Explanation

After the incident, the FAA sent radar materials to its Technical Center near Atlantic City for specialist analysis. This phase marked a major turning point in the official interpretation. [Center for Inquiry]centerforinquiry.s3.amazonaws.comCenter for Inquiry Special ReportsCenter for InquirySpecial ReportsMarch 19, 2019 — This analysis showed that the sporadic second blip was due to a phenomenon known as "un…Published: March 19, 2019

The review concluded that the radar tapes did not confirm an independently operating object shadowing Flight 1628. Instead, analysts argued that at least some anomalous returns likely resulted from radar processing artefacts.

One frequently cited explanation involved what investigators described as an “uncorrected primary and beacon target”. In simple terms, radar systems could sometimes produce misleading duplicate or offset echoes associated with the known aircraft rather than a separate vehicle. [Center for Inquiry]centerforinquiry.s3.amazonaws.comCenter for Inquiry Special ReportsCenter for InquirySpecial ReportsMarch 19, 2019 — This analysis showed that the sporadic second blip was due to a phenomenon known as "un…Published: March 19, 2019

The FAA’s January 1987 position therefore became substantially more cautious than early media reports suggesting radar confirmation of a UFO. UPI reported that federal investigators said the radar review failed to confirm an unidentified object accompanying the aircraft. [UPI]upi.comController confirms UFO sightingUPIController confirms UFO sighting - UPI Archives30 Dec 1986 — An air controller said radar showed a mysterious object following a Japan…

Why the technical explanation mattered

The FAA was not merely dismissing witness testimony. The technical review addressed a specific question:

Did radar systems independently verify another craft?

The official answer became “not conclusively”.

That distinction is important because the JAL 1628 case is often described in popular UFO literature as “radar confirmed”. The surviving FAA documents show something more ambiguous:

Those are not equivalent claims.

Military Radar and the Problem of Correlation

Another enduring controversy concerns reports that military radar also detected unusual traffic. Early press coverage suggested Air Force systems had corroborated the FAA observations. [The Washington Post]washingtonpost.comThe Washington PostUFO SIGHTING CONFIRMED BY FAA, AIR FORCE RADAR1 Jan 1987 — FAA flight control reports indicate the object stayed with…

Later reviews weakened those claims considerably.

Technical investigators argued the returns were too inconsistent and poorly correlated across systems to establish a genuine tracked target. If a large structured object had truly paced a Boeing 747 for an extended period, analysts expected clearer and more stable radar behaviour across multiple installations.

This became a major sceptical argument:

The absence of strong cross-confirmation pushed official conclusions toward caution rather than endorsement of the UFO interpretation.

Why intermittent returns remain controversial

Supporters of the unidentified-object interpretation argue that intermittent returns do not automatically invalidate the sighting. Long-range radar systems can produce incomplete tracks, especially in difficult atmospheric or geometric conditions. They also note that some controllers genuinely believed they were seeing unknown traffic during the event. [UPI]upi.comController confirms UFO sightingUPIController confirms UFO sighting - UPI Archives30 Dec 1986 — An air controller said radar showed a mysterious object following a Japan…

Sceptics counter that ambiguous radar artefacts are common in aviation and become especially vulnerable to over-interpretation during unusual incidents. Once pilots reported extraordinary objects, confirmation bias may have influenced how controllers interpreted weak returns.

The FAA’s own technical review ultimately aligned more closely with the sceptical position.

John Callahan and the Public Afterlife of the Radar Data

The radar controversy gained a second life years later through former FAA division chief John Callahan. Callahan publicly discussed the case in lectures and interviews, arguing that the FAA possessed significant radar and tracking data connected to the sighting. [American Ghost Walks]americanghostwalks.comhaunted alaskan skies 1986 s japan airlines flight 1628 ufo encounterAmerican Ghost WalksHaunted Alaskan Skies: 1986's JAL1628 UFO Encounter25 May 2025 — Behind the scenes, John Callahan, an FAA employee wh…Published: May 2025

In UFO culture, Callahan became an important figure because he claimed senior government personnel took the incident seriously during internal briefings. His statements helped sustain the idea that the case represented one of the strongest aviation UFO encounters on record.

However, historians and sceptical researchers note several complications:

This divide produced two parallel narratives:

• an official record emphasising inconclusive radar evidence,
• and a later UFO narrative emphasising suppressed or underappreciated radar confirmation.

The available documentation supports the first more strongly than the second.

What the Radar Record Actually Establishes

The radar evidence in the JAL 1628 case is stronger than in many UFO reports, but weaker than popular retellings often imply.

The records clearly establish several points:

That middle ground is exactly why the case remains important in Alaska UFO history. It is neither a clean debunking nor a confirmed unknown. Instead, it demonstrates how ambiguous radar data, human observation and institutional interpretation can diverge sharply during a high-profile aviation incident.

Why the FAA Analysis Still Matters

The JAL 1628 radar review remains significant because it exposed the limits of aviation tracking systems during unusual events. The case showed how difficult it can be to distinguish:

Modern discussions of unidentified anomalous phenomena often return to JAL 1628 because the FAA investigation produced an unusually rich paper trail. The case became an early example of how official agencies handled a report involving:

• trained aviation witnesses,
• radar ambiguity,
• military coordination,
• and intense public attention.

For Alaska’s UFO history specifically, the incident marked one of the rare moments when a sighting over the state moved from local aviation channels into a national debate about radar evidence and official credibility. Even decades later, the FAA’s shifting interpretation — from apparent concern to technical scepticism — remains central to understanding why the JAL 1628 encounter is still argued over today.

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Further Reading

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Useful for understanding how evidence and radar reports are evaluated.

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Endnotes

1. Source: Wikipedia
   Title: Japan Air Lines Cargo Flight 1628
   Link: https://en.wikipedia.org/wiki/Japan_Air_Lines_Cargo_Flight_1628

2. Source: upi.com
   Title: Radar review fails to confirm UFO
   Link: https://www.upi.com/Archives/1987/01/08/Radar-review-fails-to-confirm-UFO/8875537080400/
   Source snippet

   UPIRadar review fails to confirm UFO - UPI Archives8 Jan 1987 — Federal investigators said a review of radar tapes failed to show a UFO s...

3. Source: scribd.com
   Title: JAL flight1628
   Link: https://www.scribd.com/document/94376509/JAL-flight1628
   Source snippet

   PDF | Unidentified Flying Object | AviationThe Federal Aviation Administration today released documents relating to the reported sighting...

4. Source: upi.com
   Title: Controller confirms UFO sighting
   Link: https://www.upi.com/Archives/1986/12/30/Controller-confirms-UFO-sighting/4431536302800/
   Source snippet

   UPIController confirms UFO sighting - UPI Archives30 Dec 1986 — An air controller said radar showed a mysterious object following a Japan...

5. Source: jal.com
   Link: https://www.jal.com/en/
   Source snippet

   JAPAN AIRLINES Corporate InformationWe conduct social contribution activities unique to the Group through our core air transport business...

6. Source: Wikipedia
   Title: Japan Airlines
   Link: https://en.wikipedia.org/wiki/Japan_Airlines
   Source snippet

   Japan AirlinesJapan Airlines (JAL) is a major Japanese airline headquartered in Shinagawa, Tokyo. The airline's main hubs are Tokyo's...

7. Source: youtube.com
   Link: https://www.youtube.com/watch?v=KARd-HTssbg
   Source snippet

   JAL 1628 - A Model for Investigating UAP Events...

8. Source: youtube.com
   Link: https://www.youtube.com/watch?v=IcDgc3cYN4Q
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   Ancient Aliens: UFO Evidence Seized by CIA (Season 19) | History...

9. Source: documents.theblackvault.com
   Link: https://documents.theblackvault.com/documents/ufos/jal1628/733667-001-012.pdf
   Source snippet

   The Black Vault DocumentsJL1628Japan Airlines Flight 1628 on November 18, 1986. Radar data recorded by Anchorage Center does not confirm...

   Published: November 18, 1986

10. Source: documents.theblackvault.com
    Link: https://documents.theblackvault.com/documents/ufos/jal1628/733667-001-015.pdf
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    The Black Vault DocumentsMemorandumINFORMATION: Transcription concerning the incident involving Japan Airlines Flight 1628 on November 18...

11. Source: centerforinquiry.s3.amazonaws.com
    Title: Center for Inquiry Special Reports
    Link: https://centerforinquiry.s3.amazonaws.com/wp-content/uploads/sites/29/1987/07/22165315/p04.pdf
    Source snippet

    Center for InquirySpecial ReportsMarch 19, 2019 — This analysis showed that the sporadic second blip was due to a phenomenon known as "un...

    Published: March 19, 2019

12. Source: washingtonpost.com
    Link: https://www.washingtonpost.com/archive/politics/1987/01/02/ufo-sighting-confirmed-by-faa-air-force-radar/c186c4b7-54ed-459e-b94d-eeeff7b3322e/
    Source snippet

    The Washington PostUFO SIGHTING CONFIRMED BY FAA, AIR FORCE RADAR1 Jan 1987 — FAA flight control reports indicate the object stayed with...

13. Source: cdn.centerforinquiry.org
    Link: https://cdn.centerforinquiry.org/wp-content/uploads/sites/29/1987/07/22165315/p04.pdf
    Source snippet

    ReportsUSAF C-130 transport aircraft that was westbound for [Elmendorf]({{ 'elmendorf/' | relative_url }}) AFB, flying south of JAL #1628. When the C-130 pilot overheard the...

14. Source: americanghostwalks.com
    Title: haunted alaskan skies 1986 s japan airlines flight 1628 ufo encounter
    Link: https://www.americanghostwalks.com/haunted-alaskan-skies-1986-s-japan-airlines-flight-1628-ufo-encounter
    Source snippet

    American Ghost WalksHaunted Alaskan Skies: 1986's JAL1628 UFO Encounter25 May 2025 — Behind the scenes, John Callahan, an FAA employee wh...

    Published: May 2025

15. Source: archive.org
    Link: https://archive.org/details/jal1628
    Source snippet

    FAA Japan Air Lines Flight 1628 Records30 Apr 2023 — Japan Air Lines flight 1628 was a UFO incident that occurred on November 17, 1986 in...

    Published: November 17, 1986

Additional References

1. Source: facebook.com
   Link: https://www.facebook.com/61578116940070/posts/a-747-cargo-pilot-50-minutes-of-close-encounter-confirmed-by-faa-radar-the-objec/122191746998937231/

2. Source: jal.co.jp
   Link: https://www.jal.co.jp/jp/en/inter/

3. Source: journalnews.com.ph
   Link: https://journalnews.com.ph/unfriendly-skies-the-extraordinary-flight-of-jal-1628-alaskas-best-known-ufo-encounter/
   Source snippet

   Unfriendly skies: The extraordinary flight of JAL 1628...During the last 30 minutes the UFOs were tracked on military and civilian rada...

4. Source: reddit.com
   Title: black vault uncovers archives missing faa records
   Link: https://www.reddit.com/r/UFOs/comments/1d2rmv7/black_vault_uncovers_archives_missing_faa_records/
   Source snippet

   Black Vault uncovers, archives missing FAA records of...Black Vault uncovers, archives missing FAA records of Japanese Airlines JAL 1628...

5. Source: reddit.com
   Title: the ufo encounter so disturbing the cia buried it
   Link: https://www.reddit.com/r/UFOs/comments/1kgy7o7/the_ufo_encounter_so_disturbing_the_cia_buried_it/
   Source snippet

   The UFO Encounter So Disturbing, the CIA Buried It for 30...TIL Japan Airlines Flight 1628 over Alaska had a 42 minute long UFO encounte...

6. Source: reddit.com
   Link: https://www.reddit.com/r/todayilearned/comments/h8o5id/til_japan_airlines_flight_1628_over_alaska_had_a/
   Source snippet

   42 minute...TIL Japan Airlines Flight 1628 over Alaska had a 42 minute long UFO encounter Supported by Radar Data and Air Traffic Contro...

7. Source: flightsafetydetectives.com
   Title: a model for investigating uap events episode 182
   Link: https://flightsafetydetectives.com/a-model-for-investigating-uap-events-episode-182/
   Source snippet

   A Model for Investigating UAP Events – Episode 182JAL Flight 1628 UAP event was investigated in detail by the FAA could serve as a model...

8. Source: open.spotify.com
   Title: 6XWCFJBL7Dex Tu3Hm3CTJb
   Link: https://open.spotify.com/episode/6XWCFJBL7DexTu3Hm3CTJb
   Source snippet

   Japan Airlines Flight 1628 UFO Encounter6 Nov 2025 — At one point, the object appeared on three separate radar systems at once, yet none...

9. Source: jal.co.jp
   Title: JAPA N AIRLINES (JAL)
   Link: https://www.jal.co.jp/ar/en/
   Source snippet

   JAPAN AIRLINES (JAL) - Flights to Japan from US & CanadaBook flights & vacations to Tokyo, Osaka & more destinations in Japan & Asia with...

10. Source: reddit.com
    Link: https://www.reddit.com/r/UnresolvedMysteries/comments/8vcrvw/the_mysterious_and_otherworldly_flight_of_japan/
    Source snippet

    The Mysterious and otherworldly flight of Japan Airlines...The ATC reported seeing nothing on the radar indicating a object, and also re...