Within Aircraft
What if the plane is not on the tracker?
A tracker gap can weaken an aircraft explanation, but it is not enough on its own to make a sighting anomalous.
On this page
- What public trackers can and cannot show
- Military, private and incomplete broadcast data
- How to report no match without overstating it
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Introduction
A missing aircraft on a public flight tracker is useful evidence in a UFO investigation, but it is not decisive evidence. Public tracking maps are built from incomplete data sources, commercial filtering choices, volunteer receiver networks and aircraft broadcasts that are not always active or visible. In practice, “nothing showed on Flightradar24” is often better treated as a prompt for deeper checking than as proof that no aircraft was present.
This matters because many UFO reports are assessed too quickly in either direction. Some investigators dismiss witnesses because a tracker shows a nearby flight somewhere in the region. Others move too fast toward “anomalous” conclusions because a map appears empty. A balanced AI-assisted workflow should instead ask a narrower question: how complete was the tracking coverage for that place, altitude and type of aircraft at the exact time of the sighting?
What public trackers can and cannot show
Most public aircraft maps rely heavily on ADS-B, or Automatic Dependent Surveillance–Broadcast. In simple terms, many aircraft broadcast their position, altitude, speed and identification once per second using onboard equipment. Services such as Flightradar24 combine these broadcasts with multilateration (MLAT), radar feeds and other data sources to produce public maps. [Flightradar24]flightradar24.comFlightradar24How it worksGenerally, satellite-based ADS-B increases coverage of flights over the ocean where ground-based reception is no… [Flightradar24]flightradar24.comhow we track flights with mlatThrough our testing we have achieved accuracy to within 10-20 meters. Speed is also calculated…Read more…
That sounds comprehensive, but several important limits matter in UFO investigations:
- Coverage depends on receivers. Many public trackers rely on networks of volunteer ground stations. Rural areas, coastlines, mountains and low-altitude corridors may have weaker reception than major cities and airports. [Flightradar24 Support center]support.fr24.com3000115347 what is the coverage area of an ads b receiverHowever, coverage can extend up to 400 km (about 250…Read more…
- Low-altitude aircraft can disappear. Terrain, buildings and Earth curvature reduce line-of-sight radio reception, especially for helicopters, light aircraft and low drone operations.
- Not every aircraft broadcasts continuously. Some aircraft disable or restrict transmissions under specific conditions. [Aviation Tech Today]aviationtoday.comnew rule allows military aircraft turn ads b transmissions offAviation Tech TodayNew Rule Allows Military Aircraft to Turn Off ADS-B…23 Jul 2019 — Under the FAA's new ADS-B off rule, defense aircr…
- Different sites filter differently. One service may hide or anonymise aircraft that another service displays openly. [Flightradar24 Support center]support.fr24.com3000115347 what is the coverage area of an ads b receiverHowever, coverage can extend up to 400 km (about 250…Read more… [ADSB]aopa.orgWhat You Need To Know About ADS-BThe FAA's Privacy ICAO Address (PIA) program provides operators of 1090ES-equipped aircraft with an alte…
- Historical playback can differ from live data. Some services retain partial archives, while others compress, remove or smooth older tracks.
In practical UFO casework, this means a clean-looking tracker screenshot is not the same thing as a complete airspace record.
A common failure mode is treating commercial tracking apps as if they were direct air traffic control systems. They are not. They are public reconstructions assembled from multiple incomplete feeds. Even highly regarded platforms openly describe their dependence on receiver coverage and aircraft equipment. [Flightradar24]flightradar24.comSpeed is also calculated when tracking with…
Military, private and incomplete broadcast data
The most misunderstood tracker gap involves military and government aircraft. Some military flights appear openly on public trackers, while others are partially visible, anonymised or absent altogether depending on equipment status, operating area and platform policy. [Flightradar24 Support center]support.fr24.com3000115347 what is the coverage area of an ads b receiverHowever, coverage can extend up to 400 km (about 250…Read more… Reddit This creates a problem for UFO investigations because military aircraft can produce exactly the sort of unusual visual impressions that gener [reddit.com]reddit.come flying in FAA-controlled airspace, and sometimes even when they're not.Read more… ate reports: bright lights at night, fast climbs, formation manoeuvres, silent distant motion, unusual holding patterns or operations away from normal commercial corridors.
Several mechanisms can produce missing or incomplete public tracks:
Aircraft filtering and blocking
Some public services suppress selected aircraft identities or positions. Flightradar24 explicitly notes that certain military and government aircraft may be blocked entirely or anonymised. [Flightradar24 Support center]support.fr24.com3000115347 what is the coverage area of an ads b receiverHowever, coverage can extend up to 400 km (about 250…Read more…
The United States FAA also operates privacy programmes such as LADD and PIA that allow eligible aircraft operators to limit public dissemination of identifying information. [Federal Aviation Administration]faa.govFederal Aviation Administration Automatic Dependent SurveillanceFederal Aviation AdministrationAutomatic Dependent Surveillance - Broadcast (ADS-B)29 Sept 2025 — ADS-B Out works by broadcasting informa…
This does not necessarily make aircraft invisible to every receiver network, but it means different tracking sites may show different results for the same event.
Transponders switched off or restricted
Military aircraft may sometimes operate with ADS-B transmissions disabled or limited under approved procedures. Aviation industry reporting and pilot discussions both document situations where military aircraft operate without publicly visible ADS-B output. [Aviation Tech Today]aviationtoday.comnew rule allows military aircraft turn ads b transmissions offAviation Tech TodayNew Rule Allows Military Aircraft to Turn Off ADS-B…23 Jul 2019 — Under the FAA's new ADS-B off rule, defense aircr…
That does not mean “secret UFO aircraft”. It simply means that public tracking visibility is conditional rather than guaranteed.
Coverage and geometry problems
Even when an aircraft is broadcasting normally, reception can fail.
A witness may report a bright hovering light near the horizon while the actual aircraft is tens of miles away at low apparent motion relative to the observer. If the aircraft is low to the horizon from the receiver network’s perspective, intermittent tracking gaps become more likely. Helicopters are especially prone to fragmented tracks because they often operate lower than commercial jets.
In coastal and mountainous regions, these gaps become more common. A public tracker may show a flight disappearing for several minutes and then reappearing farther along its route. A witness observing only the “missing” portion could easily conclude that no aircraft were present.
Why one tracker is rarely enough
A strong investigation does not rely on a single screenshot from a single app. Different platforms ingest different sources and apply different filtering rules.
For example:
- Flightradar24 combines ADS-B, MLAT, radar and satellite sources but also limits some aircraft visibility. [Flightradar24]flightradar24.comhow flightradar24 uses mlat to counter gps jamming30 Jun 2025 — Learn how Flightradar24 uses MLAT or Multilateration to combat the problem of GPS interference, including GPS jamming and G…
- ADS-B Exchange promotes itself as an unfiltered network based directly on received broadcasts. [ADS-B Exchange]map.adsbexchange.comMLAT Feeder MapFeeders are operated by people just like you. For information on how you can become a feeder, and contribute data to the A…
- MLAT-derived tracks depend on multiple receivers hearing the same aircraft signal simultaneously, which means coverage quality varies geographically. [Flightradar24]flightradar24.comVideosIn this video we explore how ADS-B works and look at it's major components, including how this technology enables aircraft to broad…
An AI-assisted UFO workflow should therefore compare multiple sources rather than treating any single tracker as authoritative.
A useful automated check might ask:
- Was the region well covered by ADS-B receivers?
- Was the suspected aircraft type likely to broadcast ADS-B?
- Did another tracker show partial or anonymised activity?
- Were there known military exercises or restricted-airspace operations nearby?
- Did the witness describe behaviour consistent with distant aircraft geometry despite missing tracks?
The absence of a match after those checks is more meaningful than the absence of a match on one app alone.
Tracker gaps can create false “anomalies”
Public flight gaps sometimes make ordinary aircraft behaviour look extraordinary after the fact.
One common example involves apparent hovering. A distant aircraft approaching almost directly toward an observer can appear nearly stationary for several minutes while its landing lights remain extremely bright. If the track is absent or intermittent on a public map, the witness may understandably conclude the object was not a plane.
Another example involves abrupt disappearance. A flight that vanishes from a tracker because of receiver coverage loss may seem to “blink out” in retrospect when investigators compare witness times against archived maps.
AI-assisted reconstruction helps reduce these mistakes because it can model line-of-sight geometry rather than relying only on map icons. A missing icon on a public tracker is less persuasive if the witness description still matches plausible aircraft lighting, direction and motion.
This is especially important in social-media-driven UFO cases, where screenshots circulate without context. A caption such as “nothing on radar” often really means “nothing visible on one public consumer tracker at that moment”.
Drone reports are even less complete
Drone visibility on public maps is generally much weaker than aircraft visibility.
Most consumer drones do not appear on mainstream flight-tracking sites at all. Even where remote identification systems exist, public aggregation is inconsistent and fragmented. Small drones operating legally at low altitude may therefore leave little or no public trace.
This matters because witnesses often overestimate the visibility of nearby drone operations. If a hovering light is absent from aviation apps, some observers assume it cannot be a drone. In reality, the opposite is often true: many ordinary drones are invisible to public tracking services.
An AI-assisted investigation should therefore avoid using “not on the tracker” as a shortcut argument against either aircraft or drones.
How to report no match without overstating it
The safest wording in a UFO case file is usually precise and limited rather than dramatic.
Strong phrasing:
- “No matching aircraft were identified on the public data sources checked.”
- “No clear ADS-B match was found within the defined time and direction window.”
- “Public tracker coverage appears incomplete in this area at low altitude.”
Weak or misleading phrasing:
- “No aircraft were present.”
- “Radar confirmed empty skies.”
- “The object could not have been a plane.”
The distinction matters because absence of evidence is not automatically evidence of absence, especially when the evidence source is known to have gaps.
A balanced investigation should separate:
- confirmed observations,
- public tracker findings,
- limitations of those datasets,
- and the remaining uncertainty.
That approach protects both sides of the analysis. It avoids dismissing witnesses too casually, but it also avoids promoting weak negative evidence into claims of anomaly.
The practical takeaway for UFO casework
In AI-assisted UFO investigation, missing public flight tracks should usually be treated as a caution flag rather than a conclusion. A gap may slightly weaken an aircraft explanation, particularly in dense commercial airspace with strong receiver coverage, but it rarely rules aircraft out on its own.
The most reliable workflow combines:
- multiple tracking services,
- geometry reconstruction,
- local airspace context,
- altitude and lighting analysis,
- and explicit acknowledgement of dataset limits.
Cases become more interesting not merely when a tracker is empty, but when multiple independent checks fail simultaneously while the witness description still resists ordinary explanations.
Endnotes
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Source: flightradar24.com
Link: https://www.flightradar24.com/how-it-worksSource snippet
Flightradar24How it worksGenerally, satellite-based ADS-B increases coverage of flights over the ocean where ground-based reception is no...
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Source: flightradar24.com
Title: how we track flights with mlat
Link: https://www.flightradar24.com/blog/inside-flightradar24/how-we-track-flights-with-mlat/Source snippet
Through our testing we have achieved accuracy to within 10-20 meters. Speed is also calculated...Read more...
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Source: faa.gov
Title: Federal Aviation Administration Automatic Dependent Surveillance
Link: https://www.faa.gov/about/office_org/headquarters_offices/avs/offices/afx/afs/afs400/afs410/ads-bSource snippet
Federal Aviation AdministrationAutomatic Dependent Surveillance - Broadcast (ADS-B)29 Sept 2025 — ADS-B Out works by broadcasting informa...
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Source: reddit.com
Link: https://www.reddit.com/r/ADSB/comments/sp0id2/reasons_we_door_dontsee_military_aircraft/Source snippet
e flying in FAA-controlled airspace, and sometimes even when they're not.Read more...
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Source: faa.gov
Link: https://www.faa.gov/air_traffic/technology/equipadsb/privacySource snippet
Federal Aviation AdministrationADS-B Privacy22 Mar 2025 — The FAA acknowledges the desire of some operators to limit the availability of...
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Source: flightradar24.com
Link: https://www.flightradar24.com/how-it-works/mlatSource snippet
Speed is also calculated when tracking with...
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Source: reddit.com
Link: https://www.reddit.com/r/ADSB/comments/18l27c7/adsb_tracking_websites_do_not_show_every_aircraft/Source snippet
Neither radar nor hobbyist tracking has perfect coverage of the U.S., let...Read more...
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Source: flightradar24.com
Title: how flightradar24 uses mlat to counter gps jamming
Link: https://www.flightradar24.com/blog/aviation-explainer-series/how-flightradar24-uses-mlat-to-counter-gps-jamming/Source snippet
30 Jun 2025 — Learn how Flightradar24 uses MLAT or Multilateration to combat the problem of GPS interference, including GPS jamming and G...
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Source: flightradar24.com
Link: https://www.flightradar24.com/blog/videos/how-does-ads-b-work/Source snippet
VideosIn this video we explore how ADS-B works and look at it's major components, including how this technology enables aircraft to broad...
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Source: flightradar24.com
Title: Apply for a free ADS-B receiver
Link: https://www.flightradar24.com/apply-for-receiverSource snippet
Each week Flightradar24 sends out 30-50 complete ADS-B receiver sets...Read more...
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Source: flightradar24.com
Title: how does fr24 track aircraft
Link: https://www.flightradar24.com/blog/inside-flightradar24/how-does-fr24-track-aircraft/Source snippet
How does Flightradar24 track aircraft?4 Apr 2024 — We combine data from several data sources including ADS-B, MLAT, satellite, and variou...
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Source: flightradar24.com
Title: Build your own ADS-B receiver
Link: https://www.flightradar24.com/build-your-ownSource snippet
Pi24 client for flight trackingFind out how to build your own ADS-B receiver with Flightradar24 and you can help us increase the flight t...
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Source: forum.flightradar24.com
Title: 222620 ads b aircraft now only reported as mlat
Link: https://forum.flightradar24.com/forum/radar-forums/flightradar24-feeding-data-to-flightradar24/222620-ads-b-aircraft-now-only-reported-as-mlatSource snippet
flightradar24.comADS-B aircraft now only reported as MLAT?28 Nov 2023 — Any idea why an aircraft (SE-VPF) with ADSB-out, that before has...
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Source: flightradar24.com
Title: how we track flights with ads b
Link: https://www.flightradar24.com/blog/inside-flightradar24/how-we-track-flights-with-ads-b/Source snippet
How We Track Flights with ADS-B22 May 2015 — Each receiver is limited in range from 250-450 km (150-250 mi) due to the high frequency (10...
Published: May 2015
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Source: flightradar24.com
Title: expands global coverage with aireon space based ads b data
Link: https://www.flightradar24.com/blog/inside-flightradar24/flightradar24-expands-global-coverage-with-aireon-space-based-ads-b-data/Source snippet
Flightradar24 expands global coverage with Aireon space-...23 Feb 2026 — Flightradar24 data now includes space-based ADS-B positions via...
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Source: flightradar24.com
Link: https://www.flightradar24.com/how-it-works/ads-b -
Source: faa.gov
Link: https://www.faa.gov/air_traffic/technology/equipadsb/resources/faqSource snippet
Frequently Asked Questions | Federal Aviation Administration1 Aug 2025 — ADS-B Out avionics require a valid ICAO aircraft address to be t...
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Source: support.fr24.com
Title: 3000115347 what is the coverage area of an ads b receiver
Link: https://support.fr24.com/support/solutions/articles/3000115347-what-is-the-coverage-area-of-an-ads-b-receiver-Source snippet
However, coverage can extend up to 400 km (about 250...Read more...
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Source: map.adsbexchange.com
Link: https://map.adsbexchange.com/mlat-map/Source snippet
MLAT Feeder MapFeeders are operated by people just like you. For information on how you can become a feeder, and contribute data to the A...
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Source: aviationtoday.com
Title: new rule allows military aircraft turn ads b transmissions off
Link: https://www.aviationtoday.com/2019/07/23/new-rule-allows-military-aircraft-turn-ads-b-transmissions-off/Source snippet
Aviation Tech TodayNew Rule Allows Military Aircraft to Turn Off ADS-B...23 Jul 2019 — Under the FAA's new ADS-B off rule, defense aircr...
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Source: support.fr24.com
Title: Military and government aircraft may also be blocked entirely
Link: https://support.fr24.com/support/solutions/articles/3000117426-why-is-some-aircraft-information-limited-or-not-visible-Source snippet
Flightradar24 Support centerWhy is some aircraft information limited or not visible?10 Apr 2026 — High-profile aircraft, like Air Force O...
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Source: adsbx.discourse.group
Link: https://adsbx.discourse.group/t/adsb-exchange-frequently-asked-questions/341Source snippet
MLAT is derived from... The FAA does have programs such as PIA for users concerned about ADS-B...
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Source: adsbexchange.com
Link: https://www.adsbexchange.com/Source snippet
ADS-B ExchangeADS-B ExchangeGlobal Flight Tracking. Built on Accuracy. Powered by over 24,000 receivers and trusted by more than 11 milli...
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Source: facebook.com
Link: https://www.facebook.com/flightradar24/posts/around-98-of-our-coverage-comes-from-ground-based-receivers-with-internet-access/1395071525993295/Source snippet
Flightradar24.comFlightradar24 combines data from several data sources including ADS-B, MLAT and radar data.... The distance limit makes...
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Source: adsbexchange.com
Link: https://www.adsbexchange.com/faq/Source snippet
Help CenterWe have moved the FAQ to our new Help Center. Check it out! Need Some Help? Get On Our Radar. Sign up for ADSB Exchange's quar...
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Source: adsbexchange.com
Link: https://www.adsbexchange.com/api/aircraft/v2/docsSource snippet
ADSB Exchange API DocumentationThe ADSB Exchange API provides real-time access to live global flight data, enabling retrieval of detailed...
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Source: globe.adsbexchange.com
Link: https://globe.adsbexchange.com/Source snippet
adsbexchange.comADS-B Exchange - track aircraft liveADS-B Exchange - track aircraft live - aircraft flight history...
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Source: support.adsbexchange.com
Link: https://support.adsbexchange.com/hc/en-usSource snippet
adsbexchange.comADS-B Exchange Help CenterFrom commercial data access to aircraft tracking, data corrections, or becoming a feeder, we'll...
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Source: Wikipedia
Title: Automatic Dependent Surveillance–Broadcast
Link: https://en.wikipedia.org/wiki/Automatic_Dependent_Surveillance%E2%80%93BroadcastSource snippet
Automatic Dependent Surveillance–BroadcastADS-B is an aviation surveillance technology and form of electronic conspicuity in which an...
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Source: x.com
Link: https://x.com/flightradar24/status/1884841093046661480Source snippet
r24.com/blog/how-...Read more...
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Source: aopa.org
Link: https://www.aopa.org/go-fly/aircraft-and-ownership/ads-bSource snippet
What You Need To Know About ADS-BThe FAA's Privacy ICAO Address (PIA) program provides operators of 1090ES-equipped aircraft with an alte...
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Source: wired.com
Title: ads b exchange jetnet sale
Link: https://www.wired.com/story/ads-b-exchange-jetnet-sale/Source snippet
ADS-B Exchange, the Flight Tracker That Powered @...Jan 27, 2023 — ADS-B Exchange, beloved for resisting censorship, was sold to a compa...
Additional References
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Source: nbaa.org
Link: https://nbaa.org/aircraft-operations/security/privacy/ads-b-privacy-faq/Source snippet
ADS-B Privacy FAQThe FAA's Limiting Aircraft Data Displayed (LADD) and Privacy ICAO Address (PIA) programs offer privacy protections in t...
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Source: wired.com
Link: https://www.wired.com/story/elon-musk-elonjet-flight-tracker-transparencySource snippet
Musk claims that these trackers provide "assassination coordinates." Musk's campaign against sharing such data prompted warnings from the...
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Source: facebook.com
Link: https://www.facebook.com/groups/218676792817854/posts/1445695896782598/Source snippet
Tracking military aircraft with ads-b appOn the ADS-B exchange website you have the ability to track only military aircraft... ✈️In line...
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Source: adsbx.zendesk.com
Title: 37363518713613 How is ADS B Exchange different than other flight tracking sites
Link: https://adsbx.zendesk.com/hc/en-us/articles/37363518713613-How-is-ADS-B-Exchange-different-than-other-flight-tracking-sitesSource snippet
is ADS-B Exchange different than “other” flight tracking...13 Jun 2025 — Every time you see an aircraft move on ADS-B Exchange it is bas...
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Source: youtube.com
Link: https://www.youtube.com/watch?v=KahiBjBmgrc -
Source: nbaa.org
Link: https://nbaa.org/aircraft-operations/communications-navigation-surveillance-cns/ads-b/faa-permits-ads-b-off-military-sensitive-flights/Source snippet
Aircraft accessing RVSM airspace are required to verify altitude-keeping performance for...Read more...
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Source: interactive.aviationtoday.com
Title: what is the answer to business aviations ads b privacy concern
Link: https://interactive.aviationtoday.com/what-is-the-answer-to-business-aviations-ads-b-privacy-concern/Source snippet
is the Answer to Business Aviation's ADS-B Privacy...15 Oct 2018 — However, certain aspects of ADS-B have reduced privacy they previousl...
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Source: adsbx.discourse.group
Link: https://adsbx.discourse.group/t/featured-content-the-public-value-of-unfiltered-flight-tracking-insights-by-adsbexchange/37Source snippet
Featured Content: The Public Value of Unfiltered Flight Tracking12 Sept 2023 — ADS-B Exchange data isn't limited to commercial and govern...
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Source: e3aviationassociation.com
Title: understanding ads b compliance in general aviation
Link: https://e3aviationassociation.com/aviation-articles/understanding-ads-b-compliance-in-general-aviation/Source snippet
Understanding ADS-B Compliance in General Aviation27 Dec 2025 — Explore ADS-B compliance and its impact on aviation safety, including cos...
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Source: discussions.flightaware.com
Title: large increase in mlat positions but not aircraft
Link: https://discussions.flightaware.com/t/large-increase-in-mlat-positions-but-not-aircraft/81244Source snippet
Increase in MLAT positions but not Aircraft22 Jan 2022 — MLAT is showing you aircraft which are either out of range for your device or wh...
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