Why some planes don't show up on the map

7 min read · Updated October 11, 2026

The quick checklist

If you can see or hear an aircraft but cannot find it in the live sky tool, run through these in order:

1. Wait 10 to 20 seconds for the next refresh or two.
2. Check whether the plane is low (below a couple of thousand feet). Low aircraft are the most likely to be missed.
3. Consider whether it is a glider, balloon, vintage aircraft, ultralight or military aircraft.
4. Check whether it might be farther away than you think, beyond the area the list covers.

The rest of this guide explains each cause.

1. The aircraft does not broadcast ADS-B

ADS-B only works if the aircraft transmits it. In the US, ADS-B Out has been required since January 1, 2020 in busy and high airspace, but not everywhere. Aircraft that commonly lack it include:

• Gliders and balloons, which are exempt from much of the rule and often have no electrical system.
• Antique and vintage aircraft certified without an electrical system, and some experimental or ultralight aircraft.
• Aircraft that stay low and away from airports, such as some crop dusters or bush planes, which never enter airspace where ADS-B is required.
• Some military aircraft. Military aircraft often broadcast ADS-B, especially transports and tankers like the C-17 and KC-135, but they are allowed to switch it off for training or operational reasons, and fighters often do.
• Drones. Most consumer and commercial drones are not allowed to transmit ADS-B Out at all; they broadcast Remote ID over Wi-Fi or Bluetooth instead, which ADS-B receivers do not hear.

Outside the US, rules differ, and in many countries small private aircraft are not required to carry ADS-B.

2. No receiver can hear it

Live maps depend on ground receivers, and ours uses the airplanes.live community network of volunteer feeders. ADS-B signals travel in straight lines, so a receiver can only hear an aircraft it has line of sight to. The radio horizon is roughly 1.23 times the square root of the height in feet, in nautical miles. An aircraft at 35,000 ft is visible to receivers up to about 230 nm away. A helicopter at 500 ft has a horizon of only about 27 nm, and hills, trees and buildings cut that much shorter.

That means:

• A jet at cruise altitude almost always shows up, even in rural areas.
• A small plane or helicopter flying low over a valley, a city canyon or a remote area may be invisible until it climbs.
• Coverage can be patchy in thinly populated regions, over mountains and over water.

If you see planes taking off from a nearby small airfield appear only once they are a few hundred feet up, this is why.

3. 978 MHz UAT and receiver setup

In the US, many small aircraft flying below 18,000 ft use UAT on 978 MHz instead of 1090ES. A receiver tuned only to 1090 MHz will not hear them directly. Many networks cover the gap with dual receivers in some places, but coverage of UAT traffic is generally thinner than for 1090 MHz.

4. Mode S only: MLAT or nothing

Some aircraft have a Mode S transponder but do not broadcast position. The network can still locate them through multilateration, but only if at least four synchronized receivers hear the same signal. In dense areas this works well. In sparse ones the aircraft simply does not appear. MLAT positions also lag and jump more than ADS-B ones, so a plane may appear in a slightly wrong spot.

Aircraft with only an older Mode C transponder send altitude but no identity, and generally cannot be located by community networks.

5. Privacy programs: LADD and PIA

US aircraft owners have two FAA privacy options:

• LADD (Limiting Aircraft Data Displayed) asks companies that receive FAA flight data to hide or limit the aircraft. It applies to FAA-sourced data, not to the radio broadcast itself. Community networks that build their maps from their own receivers are generally not bound by it, so LADD aircraft often still appear on them, though policies differ between sites.
• PIA (Privacy ICAO Address) lets an owner broadcast a temporary ICAO address that is not linked to the aircraft's registration in public records. The aircraft still appears on the map, but its type and registration may show as unknown, and the callsign may be an anonymous one.

So a privacy program usually makes a plane harder to identify rather than invisible on a community map.

6. Data delays and timing

There is always some delay between a broadcast and the dot on your screen: the receiver decodes it, sends it to the aggregator, the aggregator publishes it, and our tool fetches it. Most of the time the total is a few seconds, and the tool refreshes about every 10 seconds. A plane that just popped above the trees, or one moving quickly at low level, may lag behind what you see.

Aircraft can also drop out briefly when signals are blocked, for example during steep turns that shadow the antenna.

7. It is farther away than it looks

People tend to underestimate distance. A large jet low on the horizon can easily be 30 to 50 miles away. If the tool only lists aircraft within a set radius of you, that plane may fall outside it. Our guide on how far away a plane is has a quick way to estimate.

8. Bad or missing data

Occasionally an aircraft broadcasts a wrong or blank callsign, no altitude, or a position that is clearly off because of GPS interference or equipment faults. Aggregators filter obviously bad positions, which can briefly remove an aircraft from the map.

9. It is not an aircraft

At dusk, satellites and the International Space Station catch sunlight while the ground is dark. They glide silently in a straight line without blinking. Starlink satellites shortly after launch appear as a line of evenly spaced lights. Planets near the horizon can look like hovering landing lights. None of these will appear on an aircraft map. See spotting planes at night.

Can you help fill the gaps?

Yes. Coverage improves every time someone sets up a receiver. A basic feeder is a small antenna, a USB software-defined radio and a single-board computer. If low aircraft near you are often missing, a feeder with a clear view of the sky would help everyone nearby. airplanes.live has information on how to join.

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