Use flight tracking websites and apps to see the plane overhead in real time

When you hear a plane overhead and want to know what it is, the fastest way is to use a live flight tracker. These websites and apps show you every commercial aircraft in the air right now, where it came from, where it's going, and how high it's flying. You can point your phone at the sky, and the app will often identify the plane automatically.

The most common free trackers are FlightRadar24, Flightradar24 (the website version), ADS-B Exchange, and Plane Finder. All of them work the same way: they receive signals from aircraft transponders and plot the planes on a map. Open the app or website, zoom in on your location, and you'll see the aircraft passing overhead with their call signs, altitudes, and destinations labeled.

If you're using a smartphone app, many of them have an "augmented reality" mode. Point your camera at the sky, and the app will overlay flight information directly onto what you see. This makes it much easier to match the plane you're looking at to the data on your screen.

Key Takeaways

  • FlightRadar24 and similar apps show every commercial aircraft in the air with its route, altitude, and destination in real time.
  • Most flight trackers are free to read and use, though some offer paid versions with extra features like historical flight data.
  • Augmented reality mode on smartphone apps lets you point your camera at the sky and see the plane's information overlaid on the image.
  • The plane's call sign (like "United 447") appears on the tracker and matches the aircraft's radio identifier, not necessarily its flight number.
  • Military aircraft, small private planes, and some helicopters may not appear on public trackers because they don't broadcast their positions.

What information you'll see on a flight tracker

When you find a plane on a tracker, the display shows several pieces of information. The call sign is the aircraft's radio identifier—it usually starts with an airline code (like "UAL" for United or "DAL" for Delta) followed by numbers. This is not the same as the flight number you'd see on a ticket; it's what air traffic control uses to talk to the pilot.

You'll also see the plane's current altitude (in feet), its ground speed, the direction it's heading, and its departure and destination airports. Most trackers show the aircraft type as well—whether it's a Boeing 737, Airbus A320, or another model. Some trackers include the airline name, the number of passengers on board (if that data is available), and how long the flight has been in the air.

The map view shows the plane's route as a line from where it took off to where it's headed, with the aircraft's current position marked along that line. If you tap or click on the plane, you can usually see more details, including the registration number (a unique identifier painted on the fuselage) and sometimes even photos of that specific aircraft.

Which flight trackers work best and what they cost

FlightRadar24 is the most widely used tracker and works on both iPhone and Android. The free version shows all aircraft and their basic information. The paid version ($4.99 per month or $49.99 per year) adds features like flight history, detailed aircraft information, and the ability to track specific planes over time. For most people who just want to identify a plane overhead, the free version is enough.

ADS-B Exchange is another popular option and is completely free with no paid tier. It shows the same real-time data as FlightRadar24 but is run by volunteers and aviation enthusiasts. Plane Finder is also free and works similarly. All three trackers pull data from the same source—aircraft transponder signals—so the planes you see are the same across all of them.

If you want a simpler experience without downloading an app, you can visit FlightRadar24.com or ADSBexchange.com in your web browser. The website versions work on any device and don't require installation. The trade-off is that apps are usually faster and have better augmented reality features.

Why some planes don't show up on trackers

Not every aircraft overhead will appear on a public flight tracker. Commercial airliners almost always broadcast their position, so you'll see them. However, military aircraft, government planes, and many private jets disable their transponders or use military-only frequencies that public trackers can't receive. If you see a plane but it doesn't show up on the tracker, it's likely one of these types.

Small general aviation planes—the kind you might see at a local airport—often don't have transponders at all, or they have older equipment that doesn't broadcast to the public network. Helicopters vary; some show up and some don't, depending on their equipment and whether they're operating under military or civilian rules.

If a plane is very high up (above 35,000 feet) and far from any receiver stations, it might not show up either, though this is rare over populated areas where receiver networks are dense.

How to identify a plane if the tracker isn't working

If you're having trouble finding the plane on a tracker, try zooming out on the map to make sure you're looking at the right area. Sometimes the plane moves faster than the display updates, so it may have already passed your location. Refresh the page or close and reopen the app to get the latest data.

If the tracker shows nothing overhead but you can clearly hear or see a plane, it's probably a military aircraft, a private plane, or a helicopter. You can try posting a photo or description to aviation forums like Reddit's r/whatplane or r/aviation, where enthusiasts can often identify aircraft from photos or descriptions of their sound and appearance.

Another option is to contact your local airport directly. If the plane is landing or taking off nearby, the airport's operations team can tell you what aircraft is in the area, though they may not provide this information to the public for security reasons.

Understanding call signs versus flight numbers

A common source of confusion is the difference between a plane's call sign and its flight number. The call sign is what you see on a flight tracker—it's the aircraft's unique radio identifier used by air traffic control. The flight number is what appears on your ticket and the airport departure board.

For example, a United Airlines flight might have the call sign "UAL456" on the tracker but be listed as "United 456" or "UA456" on your ticket. They refer to the same flight, but the call sign is the official radio designation. Some airlines use the same call sign for multiple flights throughout the day, while others assign unique call signs to each flight.

If you're trying to track a specific flight you're supposed to be on, search for the flight number on the tracker, not the call sign. Most trackers have a search function where you can type in the flight number and it will show you that aircraft's current position and status.

What to do if a flight is delayed and you want to track it

If you're waiting for someone to arrive and their flight is delayed, a flight tracker is one of the best ways to see where the plane actually is. Search for the flight number in the tracker, and you'll see its real-time position, altitude, and estimated arrival time. This is often more current than the airline's website, which can lag by several minutes.

The tracker will show you if the plane is still on the ground at the departure airport, if it's in the air, or if it's already on approach to the destination. You can also see how fast it's traveling and estimate roughly when it will land based on its current speed and distance remaining.

Keep in mind that the tracker shows the plane's position, not the airline's official delay status. If the airline says the flight is delayed but the tracker shows it's already in the air, the plane may have taken off later than scheduled but is now on its way. For official delay information and the reason for the delay, check the airline's website or call their customer service line.

Frequently Asked Questions

Can I see military planes on flight trackers?

Most military aircraft don't broadcast their positions on public trackers because they disable their transponders for security reasons. Some military transport planes (like C-130 Hercules) do show up occasionally, but fighter jets and classified aircraft will not appear. If you see a military plane overhead, it won't show up on FlightRadar24 or similar apps.

Why does the plane's altitude keep changing on the tracker?

Aircraft climb and descend throughout their flight. During takeoff, the plane climbs to its cruising altitude (usually 30,000 to 40,000 feet for commercial flights). As it approaches its destination, it descends. The tracker updates this information in real time, so you'll see the altitude number change as the plane moves through the sky.

Is it legal to track planes with these apps?

Yes, using public flight trackers is completely legal. The data comes from aircraft transponder signals that are broadcast publicly for safety and air traffic control purposes. You're not hacking anything or accessing private information—you're just receiving signals that the aircraft is already sending out.

Can I find out who is on a specific flight?

No, flight trackers show only the aircraft's route, altitude, and destination. They do not show passenger lists or crew information. That data is private and protected by airlines and aviation regulations.

What's the difference between ground speed and airspeed on the tracker?

Ground speed is how fast the plane is moving over the ground, which is what the tracker shows. Airspeed is how fast the plane is moving through the air. Wind affects the difference—a plane flying into a headwind will have a lower ground speed than its airspeed, while a tailwind increases ground speed. Most trackers show ground speed because that's what determines how long the flight will take.