Use a free flight-tracking website to see the plane's tail number, airline, and destination

When you hear a plane overhead, you can find out exactly what it is within seconds using Flightradar24 or ADS-B Exchange. Both are free websites that show live aircraft positions on a map. Open the site on your phone or computer, zoom in on your location, and you will see aircraft symbols with their call signs (the airline code plus numbers, like "UAL456"). Click on any plane to see its altitude, speed, direction, and where it is headed.

Flightradar24 is the easiest to start with because the map is intuitive and the information is clearly labeled. ADS-B Exchange shows the same data but includes military and private aircraft that Flightradar24 sometimes filters out. Both update in real time, so if you see a plane and check when ready, you will get accurate information about that specific flight.

Key Takeaways

  • Flightradar24 and ADS-B Exchange are free websites that show live aircraft positions, call signs, altitudes, and destinations on a map you can zoom into your location.
  • The call sign shown on the map (like "DAL123") tells you the airline and flight number; clicking it reveals the aircraft type, speed, and destination airport.
  • Military aircraft, helicopters, and small private planes may not appear on Flightradar24 but usually show up on ADS-B Exchange.
  • If a plane is not on either map, it may be too low to be tracked, a military flight with data blocked, or a helicopter operating below radar coverage.

What the call sign tells you

The call sign is a two- or three-letter airline code followed by numbers. "UAL456" means United Airlines flight 456. "SWA1200" is Southwest Airlines 1200. These codes are standardized worldwide, so you can look up the airline when ready. The flight number itself does not change day to day—the same route often uses the same number, so if you see "DAL123" overhead regularly at the same time, it is probably the same scheduled flight.

Once you click on the plane, the tracking site shows you the aircraft type (Boeing 737, Airbus A320, etc.), which tells you roughly how many seats it has and how loud it will be. A regional turboprop is much smaller and noisier than a wide-body jet. You will also see the current altitude in feet and the destination airport code—"LAX" for Los Angeles, "ORD" for Chicago, and so on.

Why some planes do not show up on the map

Military aircraft often do not appear on public tracking sites because their data is blocked for security reasons. You might see a military transport plane or fighter jet overhead but find nothing on Flightradar24. Helicopters sometimes appear, but many operate below the altitude where tracking receivers pick them up, so they vanish from the map. Small private planes and charter flights may also be absent if they are not broadcasting their position to the public network.

If a plane is very low—landing or taking off—it may drop off the map briefly because ground-based receivers have a limited range. Once it climbs higher, it reappears. Planes flying over water or remote areas may also have gaps in coverage depending on where tracking receivers are located.

How to identify the aircraft type if you only hear it

If you hear a plane but cannot see it through clouds or darkness, the sound itself gives clues. Jet engines produce a steady, high-pitched roar. Turboprops (smaller regional planes) sound like loud propellers with a rhythmic whine. Helicopters have a distinctive chopping sound from the rotor blades. A very loud, deep rumble usually means a large wide-body jet like a Boeing 777 or Airbus A380.

Once you narrow it down by sound, check the tracking map for planes at high altitude in your area at that moment. If you see a 737 and a 777 both overhead, the 777 will be louder. This method is less precise than seeing the plane, but it helps when visibility is poor.

Tracking planes during flight delays or weather

If you are waiting for a flight or tracking a delayed arrival, the same tools show you exactly where the plane is right now. Search for the flight number (like "UAL456") directly in Flightradar24's search box, and it will center the map on that aircraft. You can watch it approach your airport in real time, which gives you a better sense of when it will actually land than the airline's estimate alone.

During bad weather, tracking the plane's position helps you understand why delays happen. If a plane is circling or holding at altitude, you can see it on the map. If it is still an hour away, the delay makes sense. If it is already on the ground, the delay is likely a gate or crew issue, not a weather problem.

Mobile apps and browser extensions

Both Flightradar24 and ADS-B Exchange have free mobile apps that work on iPhone and Android. The apps let you point your phone at the sky and see which plane is directly overhead—some versions use your phone's camera to overlay flight data on the live view. This is faster than opening a browser and zooming to your location manually.

If you prefer your computer, browser extensions for Chrome and Firefox let you see live flight data without opening a separate tab. Some people keep a tracking window open all day if they live near a busy airport and want to know what is flying over at any moment.

Frequently Asked Questions

Can I see military planes on these tracking sites?

Most military aircraft do not broadcast their position to public tracking networks, so they will not appear on Flightradar24. ADS-B Exchange sometimes shows military flights, but data is often limited or delayed. If you see a military plane overhead and it is not on either map, that is normal—the military blocks this information intentionally.

Why does a plane disappear from the map and then reappear?

Planes drop off the map when they are too low for ground receivers to pick up their signal, usually during landing or takeoff. Once they climb higher, they reappear. Temporary gaps can also happen in areas with poor receiver coverage, especially over water or mountains.

What does the altitude number mean?

Altitude is shown in feet above sea level. Commercial jets typically cruise between 30,000 and 40,000 feet. A plane showing 5,000 feet is descending toward an airport. A plane at 500 feet is on final approach to land. The higher the altitude, the farther away the plane is from landing.

Can I track a specific plane by its tail number instead of flight number?

Yes. Every aircraft has a unique tail number (like "N12345" in the United States). If you see the tail number on the fuselage, you can search for it on Flightradar24 or ADS-B Exchange to see that specific plane's history and current location. This is useful if you want to follow one aircraft over multiple flights.

Why is a plane circling above my area?

Planes circle (called "holding") when the airport is congested and they cannot land when ready. Weather, runway closures, or air traffic delays cause this. Tracking the plane's position shows you how long it has been holding and whether it is descending toward the airport or staying at a fixed altitude. If it is at a fixed altitude and circling, it is waiting for clearance to land.