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Why Jet Trails Glow Like UFOs
Contrails and jet exhaust near sunrise or sunset can glow red, orange or white while the aircraft itself is hard to see.
On this page
- Low sun illumination
- Contrails versus solid objects
- Afterburners and hidden aircraft
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Introduction
Sunlit contrails and glowing jet exhaust can produce some of the most convincing ordinary UFO reports because the bright part of the scene is often not the aircraft itself. Around sunrise or sunset, a high-flying jet may still be in direct sunlight while people on the ground are already in shadow. Its condensation trail can glow white, gold, orange or red against a darker sky, making a level aircraft look like a burning object, a hovering light, a falling meteor, a missile launch or an unknown craft. The mechanism is simple: aircraft exhaust can form ice-crystal clouds, and low-angle sunlight can illuminate those crystals while the aircraft is too small, distant or silhouetted to recognise. The result is an identified flying object that looks dramatic precisely because the familiar object is hidden and the trail is doing the visual work. Federal Aviation Administration [NASA Earthdata]earthdata.nasa.govtrail contrailsNASA EarthdataOn the Trail of Contrailsby L Naranjo · 2020 — Contrails, or condensation trails, form when water vapor from airline exhaus…
Why low sun makes jet trails look strange
A contrail is not smoke. It is a cloud-like trail, usually made of ice crystals, produced when hot, moist aircraft exhaust mixes with very cold upper air. The Federal Aviation Administration describes contrails as ice crystals formed from aircraft-engine water vapour condensing onto atmospheric particles and particles emitted by the engine, normally at cruise altitudes. NASA Earthdata gives the same core mechanism: water vapour from aircraft exhaust condenses and freezes into ice crystals. [Federal Aviation Administration]faa.govFederal Aviation AdministrationContrails | Federal Aviation Administration21 Jul 2025 — Condensation trails (contrails) are ice contrails…
The UFO-like effect appears when the lighting geometry is unusual. After sunset at ground level, the Sun can still illuminate aircraft and ice crystals several miles up. To an observer, the sky may be blue-grey or darkening, while the contrail remains bright because it is higher and still sunlit. The same can happen before sunrise, when the aircraft is already in sunlight but the ground is not. Contrail Science, a long-running specialist explainer site on misidentified aircraft trails, notes that this is a common pattern in local “fireball”, “meteor” and UFO stories: someone sees a short red or fiery-looking trail just after sunset, zooms in with a camera, and the aircraft itself is not obvious. [contrailscience.com]contrailscience.comshort sunlit contrails look like ufos13 Feb 2011 — Here's one from Germany: From a video that has since been removed. The… Short Sunlit Contrails Look Like UFOs · Contrail…
Colour adds to the confusion. The same scattering that makes sunsets red and orange can tint a white contrail into a warm flame-like streak. Because the trail may be evenly illuminated, it can look like a glowing body rather than a cloud. Poor focus, phone-camera zoom, haze and atmospheric shimmer then soften the edges, making the object appear larger, brighter and less aircraft-like than it is.
Contrails versus solid objects
The key difference between a sunlit contrail and a solid UFO is that the visible shape is usually a trail, not a craft. The aircraft may be a tiny point at one end, hidden by glare, blurred by distance, or lost in the dark sky. What remains visible is the illuminated ice cloud, which can look like an object with a tail, a cigar shape, a glowing rod, a flame, or several separate lights.
Several visual clues help separate contrails from solid objects:
- The glow is often uniform. A burning aircraft, meteor or re-entering object normally changes brightness, sheds fragments or moves rapidly. A sunlit contrail can remain the same colour along much of its length because the whole ice cloud is reflecting low sunlight. [contrailscience.com]contrailscience.comlife magazine contrail photoslife magazine contrail photos
- The motion is slower than it feels. A high-altitude aircraft seen near the horizon can appear almost stationary, especially if it is travelling roughly towards or away from the observer. The trail may seem to “hang” while the aircraft covers a long distance in three-dimensional space.
- The apparent direction can be misleading. A level aircraft flying away over the horizon can look as if it is rising like a missile or falling like a meteor. In 2010, widely discussed footage off the coast of Los Angeles was reported as a possible mystery missile, but defence analysts argued that the geometry was consistent with a jet contrail viewed in perspective, with a horizontal aircraft track made to look vertical. [WIRED]wired.comL.A.'s Mystery 'Missile' Is Probably a JetL.A.'s Mystery 'Missile' Is Probably a Jet
- The shape can split or multiply. Twin-engine or four-engine jets may leave parallel trails. Gaps in humidity can break the trail into bright segments. Shadows cast by the aircraft or by one part of the trail can create dark lanes that look like structure.
This is why still images are especially vulnerable to misreading. A photograph freezes the most confusing part of the event: the aircraft is tiny, the trail is bright, and the viewer lacks the motion cues that would show a normal flight path. A short video can help, but only if it includes enough time, background stars or landmarks, and a known direction of view.
Why aircraft can vanish while the trail remains
Many UFO reports caused by contrails are not simply “people mistaking a plane for something else”. The harder problem is that the plane may genuinely be difficult to see. Commercial aircraft at cruise altitude can be tens of thousands of feet above the ground. Their fuselage may reflect little light towards the observer, or it may be hidden against a bright patch of sky. Meanwhile, the contrail is large, reflective and spread over a much wider area.
The National Weather Service describes contrails as cloud-like streamers forming behind aircraft in clear, cold, humid air, and notes that they can form through engine-exhaust water vapour added to the atmosphere. Once formed, the trail is at the mercy of upper-level winds. It can twist, widen, shear into strands or persist after the aircraft has moved on. [National Weather Service]weather.govSource details in endnotes.
This persistence is important for UFO interpretation. A witness may see a glowing trail after the aircraft has become invisible or left the frame, then reasonably ask how a “craft” could hover without wings or sound. The answer is that the visible feature is no longer the aircraft. It is a small artificial cloud at high altitude. In humid upper air, such trails can last long enough to spread into cirrus-like cloud; in drier air, they may remain short and stubby, which can make them look more object-like. [Federal Aviation Administration]faa.govFederal Aviation AdministrationContrails | Federal Aviation Administration21 Jul 2025 — Condensation trails (contrails) are ice contrails…
Historical pattern: from “mystery missile” to “burning object”
Sunlit contrail cases recur because the mechanism is ordinary but the viewing conditions are intermittent. Most people have seen white aircraft trails in daytime; fewer have watched a short, red-orange contrail hang in twilight with no obvious aircraft attached. That mismatch between expectation and appearance is what turns a routine flight into a UFO report.
The 2010 Los Angeles “mystery missile” episode is a useful comparison because it shows how quickly perspective can overpower common sense. Footage taken from a news helicopter appeared to show a plume rising steeply from the ocean. Analysts quoted by Wired argued that the more likely explanation was an aircraft flying horizontally, with its contrail seen nearly end-on, creating the illusion of a launch. The case was not a classic flying saucer report, but it belongs to the same family of misidentifications: a distant aircraft trail, low-angle light, and a misleading line of sight. [WIRED]wired.comL.A.'s Mystery 'Missile' Is Probably a JetL.A.'s Mystery 'Missile' Is Probably a Jet
A more recent European example shows the same pattern in quieter form. In February 2026, Estonian public broadcaster ERR reported that a “burning object” photographed near Koeru in central Estonia was likely aircraft contrails seen in lighting conditions particular to the season. The report is notable because the description matches the common witness impression: not “I saw a jet”, but “I saw something burning”. [ERR]news.err.eeUFO' filmed over central Estonian skies likely airplaneUFO' filmed over central Estonian skies likely airplane
These cases also show why debunking is not simply a matter of telling witnesses they saw “just a plane”. The report may begin with a real anomaly in appearance: the object really did look fiery, vertical or detached from any aircraft. The explanation lies in geometry, lighting and scale, not in the witness inventing the event.
Afterburners and hidden aircraft
Contrails are not the only aircraft-exhaust effect that can look strange. Military jets and some supersonic aircraft can produce bright exhaust when using an afterburner, known in British aviation usage as reheat. An afterburner injects additional fuel into the hot exhaust stream behind the turbine, producing extra thrust for take-off, combat manoeuvres or supersonic flight. SKYbrary, an aviation-safety knowledge base, describes afterburning as a system used mostly on military supersonic aircraft; NASA’s Glenn Research Center explains that additional fuel is injected into the hot exhaust stream, where it burns and produces extra thrust. [Skybrary]skybrary.aeroSource details in endnotes.
At night or twilight, an afterburner can make the exhaust more visible than the aircraft. NASA’s X-59 engine tests provide a clear modern example: during maximum afterburner testing, NASA described the aircraft’s plume as showing visible Mach diamonds, also called shock diamonds, against a darkening sky. These bright diamond-like structures form in high-speed exhaust plumes under particular pressure conditions and can look highly artificial to someone who does not know they are a normal jet-plume feature. [NASA]earthdata.nasa.govtrail contrailsNASA EarthdataOn the Trail of Contrailsby L Naranjo · 2020 — Contrails, or condensation trails, form when water vapor from airline exhaus…
For UFO reports, the afterburner problem is different from the contrail problem. A glowing contrail is usually a reflected-sunlight effect on ice crystals. A glowing afterburner is an engine-combustion effect. Both can hide the aircraft by drawing attention to the luminous plume, but they occur in different settings. Contrails are most associated with high-altitude cruising jets and low Sun; afterburners are more associated with military aircraft, take-off, acceleration, manoeuvring, air displays or testing.
How investigators check this explanation
A sunlit-contrail explanation becomes stronger when several independent details fit together. The most useful checks are not exotic; they are the ordinary facts that reconstruct the sighting geometry.
Investigators look first at time and direction. A report just after sunset looking west, or just before sunrise looking east, is especially compatible with a sunlit contrail. They then check altitude and lighting: the ground may be dark while airliners at cruise altitude remain sunlit. Next comes flight traffic. Commercial flight-tracking data, airport routes and military operating areas can show whether an aircraft was in the right part of the sky. Finally, they compare motion: a contrail drifting or spreading with upper winds is not behaving like a rigid craft.
Modern UAP work has increasingly emphasised this kind of data discipline. AARO, the U.S. All-domain Anomaly Resolution Office, lists aircraft, balloons, drones, birds and other ordinary causes among common objects reported as UAP, and U.S. defence reporting has stated that AARO has resolved hundreds of cases as commonplace objects including aircraft. [AARO]aaro.milOpen source on aaro.mil. NASA’s UAP study likewise framed the problem around better data collection and analysis, because many reports lack the precise metadata needed to test ordinary explanations confidently. [NASA Science]science.nasa.govSource details in endnotes.
For a witness or reader, the practical lesson is simple: a glowing trail near twilight should be checked against aircraft routes before it is treated as a solid object. A strong report would need to rule out a matching aircraft, show motion inconsistent with a drifting or perspective-skewed trail, and provide enough time, location and direction data for others to reproduce the geometry.
What this explanation does and does not cover
Sunlit contrails and glowing jet exhaust explain a recognisable subset of UFO reports: bright streaks, fiery-looking trails, short red-orange “objects”, missile-like plumes, hovering rods, and luminous exhaust effects where the aircraft is faint or missing. They do not explain every light in the sky, every structured close-range report, or every radar or infrared case. Their value is narrower and more useful: they show how an ordinary aircraft can produce a sighting that feels nothing like an aircraft to the person on the ground.
The mechanism also overlaps with, but should not be confused with, rocket-exhaust displays. Rocket plumes can create much larger twilight effects because exhaust expands at high altitude and remains sunlit against a dark sky. BBC Sky at Night Magazine, for example, identifies frozen SpaceX exhaust plumes as one modern source of UFO-like sky reports, while a 2025 UK-visible glowing spiral was widely attributed to a Falcon 9 exhaust plume reflecting sunlight. That is a related illumination problem, but not the same as an ordinary jet contrail. [Sky at Night Magazine]skyatnightmagazine.comSky at Night Magazine17 things commonly mistaken for UFOsSky at Night Magazine17 things commonly mistaken for UFOs
The strongest takeaway is that the “UFO” appearance often comes from a separation between cause and visible effect. The aircraft is small, distant or hidden; the exhaust trail is large, bright and beautifully lit. Once that separation is understood, many dramatic twilight sightings become less mysterious without becoming imaginary. They were real things in the sky, just not solid unknown craft.
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Endnotes
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Source: earthdata.nasa.gov
Title: trail contrails
Link: https://www.earthdata.nasa.gov/news/feature-articles/trail-contrailsSource snippet
NASA EarthdataOn the Trail of Contrailsby L Naranjo · 2020 — Contrails, or condensation trails, form when water vapor from airline exhaus...
-
Source: contrailscience.com
Title: short sunlit contrails look like ufos
Link: https://contrailscience.com/short-sunlit-contrails-look-like-ufos/Source snippet
13 Feb 2011 — Here's one from Germany: From a video that has since been removed. The... Short Sunlit Contrails Look Like UFOs · Contrail...
-
Source: wired.com
Title: L.A.’s Mystery ‘Missile’ Is Probably a Jet
Link: https://www.wired.com/2010/11/mystery-missile-is-probably-a-jet -
Source: weather.gov
Link: https://www.weather.gov/otx/Contrails -
Source: news.err.ee
Title: ‘UFO’ filmed over central Estonian skies likely airplane
Link: https://news.err.ee/1609951076/ufo-filmed-over-central-estonian-skies-likely-airplane-contrails -
Source: skybrary.aero
Link: https://skybrary.aero/articles/afterburner -
Source: grc.nasa.gov
Link: https://www.grc.nasa.gov/www/k-12/airplane/turbab.html -
Source: nasa.gov
Title: runs x 59 engine with maximum afterburner for first time
Link: https://www.nasa.gov/image-article/nasa-runs-x-59-engine-with-maximum-afterburner-for-first-time/ -
Source: nasa.gov
Title: diamonds from nasas x 59
Link: https://www.nasa.gov/image-article/diamonds-from-nasas-x-59/ -
Source: aaro.mil
Link: https://www.aaro.mil/ -
Source: science.nasa.gov
Link: https://science.nasa.gov/uap/ -
Source: science.nasa.gov
Link: https://science.nasa.gov/wp-content/uploads/2023/09/uap-independent-study-team-final-report.pdf -
Source: nasa.gov
Link: https://www.nasa.gov/wp-content/uploads/2023/06/contrails-k-12.pdf -
Source: science.nasa.gov
Link: https://science.nasa.gov/uap/faqs/ -
Source: grc.nasa.gov
Link: https://www.grc.nasa.gov/www/k-12/airplane/aturba.html -
Source: aaro.mil
Link: https://www.aaro.mil/UAP-Cases/Official-UAP-Imagery/ -
Source: aaro.mil
Title: UAP Records
Link: https://www.aaro.mil/UAP-Records/ -
Source: contrailscience.com
Title: life magazine contrail photos
Link: https://contrailscience.com/life-magazine-contrail-photos/ -
Source: contrailscience.com
Title: fightercontrails over kent 1941
Link: https://contrailscience.com/fightercontrails-over-kent-1941/ -
Source: contrailscience.com
Link: https://contrailscience.com/some-more-wwii-contrails/ -
Source: contrailscience.com
Link: https://contrailscience.com/broken-contrails/ -
Source: space.com
Title: ring red light ufo italy explainer
Link: https://www.space.com/ring-red-light-ufo-italy-explainer -
Source: faa.gov
Link: https://www.faa.gov/contrailsSource snippet
Federal Aviation AdministrationContrails | Federal Aviation Administration21 Jul 2025 — Condensation trails (contrails) are ice contrails...
-
Source: skyatnightmagazine.com
Title: Sky at Night Magazine17 things commonly mistaken for UFOs
Link: https://www.skyatnightmagazine.com/space-science/things-mistaken-for-ufos -
Source: Wikipedia
Link: https://en.wikipedia.org/wiki/Contrail -
Source: Wikipedia
Link: https://en.wikipedia.org/wiki/Afterburner -
Source: epa.gov
Link: https://www.epa.gov/regulations-emissions-vehicles-and-engines/Contrails -
Source: epa.gov
Link: https://www.epa.gov/system/files/documents/2025-07/epa-faa-contrails-factsheet-2025-0718.pdf -
Source: engineering.purdue.edu
Link: https://engineering.purdue.edu/~propulsi/propulsion/jets/basics/afterburner.html
Additional References
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Source: cia.gov
Link: https://www.cia.gov/readingroom/docs/CIA-RDP81R00560R000100060001-5.pdf -
Source: faa.gov
Link: https://www.faa.gov/sites/faa.gov/files/regulations_policies/policy_guidance/envir_policy/contrails.pdf -
Source: pima.gov
Link: https://www.pima.gov/438/Contrails-in-the-Sky -
Source: govinfo.gov
Link: https://www.govinfo.gov/content/pkg/CHRG-89hhrg50066O/pdf/CHRG-89hhrg50066O.pdf -
Source: youtube.com
Title: Contrails 101: How they form and why they persist
Link: https://www.youtube.com/watch?v=wX-U6L4R6aISource snippet
Understanding the sunset effect on high-altitude contrails...
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Source: facebook.com
Link: https://www.facebook.com/173FW/posts/how-many-of-you-have-had-the-opportunity-to-see-the-fiery-glow-of-the-f-15-after/3672510972777332/ -
Source: facebook.com
Link: https://www.facebook.com/MeteorologistAmberWheeler/posts/a-beautiful-view-of-the-condensation-trails-planes-leave-behind-in-the-sky/1451476689675184/ -
Source: facebook.com
Link: https://www.facebook.com/Timesnow/posts/a-mysterious-red-halo-has-appeared-once-again-over-the-tiny-italian-town-of-poss/1335778181926774/ -
Source: facebook.com
Link: https://www.facebook.com/watchoutcc/posts/-anyone-else-catch-this-in-the-sky-around-sunset%EF%B8%8F-a-few-people-reported-seeing-a/1256599689837590/ -
Source: nationalacademies.org
Link: https://www.nationalacademies.org/read/29073/chapter/6
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