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Explainer

How Flight Tracking Apps Actually Work

By The Flight Tracker Team · October 19, 2026

There are two fundamentally different ways to know something about a flight, and almost every app you have used is built on one of them.

The first listens to signals broadcast by aircraft and collects them with networks of ground receivers, which produces positions — where an aircraft is, how high, how fast, which direction. The second collects schedules and operational updates from airlines and airports through data feeds, which produces status — delayed or on time, which gate, which terminal, which baggage belt, cancelled or diverted.

Neither one is a better product. They answer different questions, and knowing which you are looking at explains almost every “why does this app say something different” moment.

Flight Tracker is built on the second approach. We use a third-party flight status provider, not our own ground receivers.

Approach A: ground receiver networks

Aircraft carry position-reporting equipment that continuously broadcasts a short message containing an identifier, altitude, speed, heading, and — usually — a position derived from satellite navigation. Anyone with a suitable antenna and a low-cost receiver can pick these messages up from perhaps 200–400 km away.

Operators of these networks distribute receivers widely, often to volunteers and enthusiasts who host one at home, and feed everything back to a central service. Software then matches reports to flights and draws a continuous track on a map.

What it gives you: a moving aircraft on a map, updated every few seconds, with altitude and speed. It is genuinely impressive and it is the right tool if your question is where is the aircraft physically right now.

Its limits:

• Coverage follows the receivers. Over oceans, deserts, polar routes, and sparsely populated regions there may be no receiver in range, so tracks go dark or jump. Satellite reception fills some of this in, at a cost.
• It cannot see the airport’s paperwork. A broadcast position does not know your gate number, your terminal, your baggage carousel, or that the airline has just cancelled tomorrow’s return.
• Not every aircraft is equally visible. Equipment fit, transmission settings, and privacy filtering all affect what reaches the network.
• Position is not status. An aircraft sitting on a taxiway looks identical whether it is 5 minutes late or 90.

Approach B: schedule and status feeds

The other approach starts from the systems airlines and airports use to run their operations: schedules, departure control, and airport information displays. Aggregators collect those records from many sources, normalise them, and expose them through an interface that apps query.

What it gives you: the fields a passenger actually acts on.

Field	Why it matters
Scheduled, estimated, and actual times	The delay, and how it is moving
Status	Scheduled, departed, en route, landed, delayed, cancelled, diverted
Gate and terminal	Where to walk, at both ends
Baggage carousel	Where the bags will appear
Airline, flight number, aircraft type	Identifying the right flight, including codeshares

Its limits:

• It is reported, not observed. A field appears when someone or some system publishes it. During heavy disruption, publishing falls behind reality.
• It is not continuous. Apps query at intervals rather than receiving a live stream, so there is always some lag between an update being published and appearing on your screen.
• Coverage varies by airline and airport. Some carriers publish rich data, some publish very little. Smaller airports may report only scheduled times.

Why the two disagree

They are measuring different events, so a difference is usually correct rather than a bug.

A receiver network sees wheels on the runway. A status feed reports the moment the aircraft is parked with the brakes set. Those are routinely 10–20 minutes apart.

Other honest sources of disagreement:

• Departure time can mean pushback, wheels-up, or the time the airline files. Different sources pick different definitions.
• A track can look normal while the flight is officially delayed because the delay was absorbed in the air.
• An airborne aircraft with a stale status means the status feed has not been updated, not that the flight is missing.
• A flight can show as cancelled while an aircraft flies the route — the airframe repositioned without passengers.

Which question does each answer better?

Your question	Better source
Is my flight delayed, and by how much?	Status feed
Which gate and terminal?	Status feed
Which baggage belt?	Status feed
Has the flight been cancelled or diverted?	Status feed
Where exactly is the aircraft over the ground right now?	Receiver network
How high and how fast is it flying?	Receiver network
Which aircraft is that overhead?	Receiver network

Most people asking about a flight are meeting someone, catching a connection, or deciding when to leave home. Those are all status questions. Enthusiast questions — watching an aircraft cross an ocean — are position questions, and a receiver-based service is the honest answer for them.

What that means for this app

We show status, times, gate, terminal, baggage carousel, airport information for 4,000+ airports, and a flight map built from what our provider supplies. We do not run receivers, so we do not claim to show you every aircraft in flight. How Flight Tracker works and our data sources set out precisely where each field comes from and how quickly it updates.

Because every field is reported by a third party and can lag during disruption, anything time-critical should be confirmed with your airline.

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