A note about Estimated coverage: when you see a dashed or gray line behind an aircraft, that's estimated coverage. Colored lines indicate actual positions. When an aircraft is out of coverage, we estimate based on great circle routes to destination.
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On the map a coloured line shows the route of the aircraft. Purple colours indicate cruising altitudes. White colours indicate the plane is on the ground. As a plane takes off, the colours change from white, to yellow, to green, to light blue, to dark blue and finally to purple.
The most well know of these is the code 7700. This is used to indicate an emergency of any kind. A pilot will enter this when in an emergency situation - either instructed by ATC after declaring an emergency or without communication if there is no time.
Generally, aircraft requesting that they not be displayed on Flightradar24 are military aircraft. Some military aircraft, such as various transport aircraft, are visible.
Does FlightRadar show private planes? Yes, it does, but the data is limited. If an operator doesn't want their personal details published, FlightRadar will block out that information or even omit showing the aircraft directly related to high-profile individuals, like Air Force One.
This is the code for a general emergency. 7700 can be entered into the transponder for a variety of reasons, and some of the most common include medical emergencies, engine failure, problems with pressurization or landing gear, issues with flight control, and more.
In most cases, our receiver network is no longer receiving a signal from the aircraft. This tends to be more common when an aircraft is flying over large bodies of water. It can also be a technical problem somewhere. FR24 has not a global coverage.
Flightradar24 is the more customizable of the two, and while FlightAware says it tracks more flights, it lacks options like showing planes on the ground. (There's also a third flight-tracking app and website, Planefinder, which looks and feels similar to Flightradar24 and has the same price for the premium version.)
The hot and humid air produced by the airplane's engine mixes with the cool and dry air outside of the airplane, resulting in the formation of contrails. In other words, contrails are condensation in the sky that manifest as white smoke.
Three transponder codes are reserved for unusual/emergency situations: - 7700 for general emergencies. - 7600 for loss of communication (radio failure). - 7500 for hijacking or other unlawful interference.