UNRESOLVED
CF-GEI-20190350763 UNRESOLVED PRIORITY: HIGH
The EasyJet EZY926L Encounter: Ghost Aircraft Over Drôme
CASE FILE — CF-GEI-20190350763 — CASEFILES CLASSIFIED ARCHIVE
Date Date when the incident was reported or occurred
2019-03-29
Location Reported location of the sighting or event
Drôme Department, Rhône-Alpes, France
Duration Estimated duration of the observed phenomenon
Several minutes
Object Type Classification of the observed object based on witness descriptions
light
Source Origin database or archive this case was sourced from
geipan
Witnesses Number of known witnesses who reported the event
2
Country Country where the incident took place
FR
AI Confidence AI-generated credibility score based on source reliability, detail consistency, and corroboration
85%
On March 29, 2019, during EasyJet flight EZY926L traveling from Lille to Nice over the Drôme region of France, the flight crew reported an encounter with an unidentified aircraft displaying "quite unusual lights." Both the pilot and co-pilot observed what they described as a "heavy" (large commercial) aircraft crossing their path from right to left at approximately 1,000 feet below their altitude. The object was detected on the aircraft's TCAS (Traffic Collision Avoidance System) instrumentation, appearing 10-15 nautical miles (20-30 kilometers) ahead at 300 meters lower altitude, traveling on an estimated heading of 060°. The crew also experienced wake turbulence near the NISAR reporting point, which they attributed to the passage of this aircraft.
The encounter presents a significant anomaly: while the TCAS system clearly registered the object—indicating it was equipped with an active transponder—no corresponding aircraft appeared on Aix-en-Provence air traffic control radars at the described trajectory and altitude. TCAS systems specifically detect aircraft equipped with transponders, not visual objects, making this technological confirmation particularly noteworthy. The pilot contacted air traffic control to report both the unusual lighting configuration and to inquire about potential heavy traffic in the area, but controllers confirmed no such aircraft was visible on their systems.
GEIPAN investigators analyzed radio communications between the flight crew and air traffic control but were unable to obtain direct testimony from the pilots. Meteorological analysis determined that atmospheric conditions on that day were not conducive to persistent wake turbulence, suggesting the turbulence and the unknown aircraft sighting may not be directly correlated. A GEIPAN aviation expert reviewed the case and confirmed the analytical findings. The case was classified as "C" (lack of exploitable information) due to insufficient witness testimony and the inability to resolve the central contradiction: an object with an active transponder visible to TCAS but invisible to ground radar.
02 Timeline of Events
March 29, 2019 - Flight in progress
Initial Visual Contact
Flight crew observes an aircraft with unusual lighting configuration crossing their path from right to left, estimated as a 'heavy' (large commercial aircraft) class vehicle.
Minutes later
TCAS Detection Registered
The cockpit TCAS system displays the unknown aircraft approximately 10-15 nautical miles ahead, 1,000 feet below their altitude (300 meters), heading 060°. Object transmitting transponder signals.
Several minutes after sighting
Wake Turbulence Encountered
Flight crew experiences wake turbulence at the NISAR reporting point, which they attribute to the passage of the previously observed aircraft.
Shortly after turbulence
Pilot Contacts Air Traffic Control
EZY926L pilot radios Aix-en-Provence ATC to report wake turbulence, inquire about heavy traffic in the area, and mention the unusual lighting observed on the aircraft.
Same timeframe
ATC Reports No Radar Contact
Air traffic controllers at Aix-en-Provence confirm no aircraft matching the described trajectory and altitude is visible on their radar systems, despite the TCAS detection.
Post-incident
GEIPAN Investigation Initiated
French space agency CNES's GEIPAN unit opens formal investigation based on air traffic control communications. Aviation expert consulted to analyze the technical contradiction.
Investigation conclusion
Case Classified C - Insufficient Data
GEIPAN closes investigation with 'C' classification due to lack of direct pilot testimony and inability to resolve TCAS-radar contradiction. Case remains unexplained.
03 Key Witnesses
EasyJet EZY926L Pilot
Commercial airline pilot (Captain)
high
Captain of EasyJet flight EZY926L on the Lille-Nice route. Professional commercial pilot with training in aircraft identification and air traffic procedures.
"The lights that were on were quite unusual... we are two who saw these lights."
EasyJet EZY926L Co-pilot
Commercial airline pilot (First Officer)
high
Co-pilot/First Officer on EasyJet flight EZY926L. Corroborating witness to the unusual aircraft and lighting configuration.
04 Analyst Notes -- AI Processed
This case presents exceptional credibility factors: two professional airline pilots as witnesses, instrumental corroboration via TCAS detection, and official air traffic control involvement. The central anomaly—TCAS detection without corresponding radar confirmation—represents a significant technical contradiction that defies conventional explanation. TCAS systems are designed to detect transponder signals, not perform visual identification, so the detection strongly suggests an aircraft equipped with functioning avionics. The simultaneous invisibility to ATC radar is highly unusual and unexplained.
Several factors elevate this case's significance: the professional training and experience of commercial airline pilots make them highly reliable observers of aerial phenomena; the instrumental detection adds objective technical data beyond subjective observation; and the meteorological analysis rules out natural explanations for the turbulence, weakening the conventional aircraft hypothesis. The description of "unusual lights" by experienced pilots who routinely observe aircraft lighting configurations suggests something genuinely anomalous. However, the lack of detailed witness interviews severely limits analysis—we have no specific description of the light patterns, colors, or configuration that made them "unusual." The case suffers from incomplete investigation rather than lack of credibility.
05 Theory Comparison
BELIEVER ANALYSIS
Unknown Aircraft with Transponder-Mimicking Technology
An unconventional aircraft or phenomenon capable of generating transponder-like signals detectable by TCAS while possessing characteristics (stealth technology, unusual flight profile, or non-conventional construction) that prevented standard radar detection. The 'unusual lights' suggest a non-standard configuration. The professional observation by trained pilots, instrumental detection, and official documentation support the presence of something genuinely anomalous that doesn't fit conventional aircraft profiles.
SKEPTIC ANALYSIS
TCAS System Malfunction/False Contact
The TCAS system may have registered a false contact due to technical malfunction, electromagnetic interference, or signal reflection. The unusual lights could have been a conventional aircraft at a different position than indicated by the faulty TCAS reading, which would explain why ATC radar didn't correlate. However, this theory struggles to explain why experienced pilots visually correlated what they saw with the TCAS display, and why both crew members found the lighting 'unusual.'
06 Verdict
ANALYST VERDICT
This incident represents a credible, unresolved anomaly with strong evidentiary support but frustrating informational gaps. The most significant factor is the TCAS-radar contradiction: an object transmitting transponder signals detectable by onboard collision avoidance systems but invisible to ground-based air traffic control radar is technically paradoxical. Possible explanations include: (1) a classified or military aircraft with specialized radar-evading capabilities while maintaining transponder operation for safety; (2) a technical malfunction either in the TCAS system creating a false contact or in ATC radar systems failing to display a legitimate aircraft; (3) an unknown phenomenon capable of generating transponder-like signals. The professional credibility of the witnesses, instrumental confirmation, and official investigation by GEIPAN make dismissing this case difficult. The "C" classification is appropriate given the lack of pilot testimony, but the core technical mystery remains genuinely unexplained. This case deserves high priority for its combination of credible witnesses, technical anomaly, and official documentation, though it lacks the detail necessary for definitive conclusions.
AI CONFIDENCE SCORE:
85%
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