What does a red plane on flight tracker mean?

Red: When an aircraft is displayed as red that means that you are currently following that specific aircraft on the map or that the aircraft's transponder is squawking an emergency code. These codes are 7500 (Hijack), 7600 (Communication Equipment Failure), 7700 (General Emergency)



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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.

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If there's a radio failure associated with an emergency, the aircraft might alternately squawk 7600 (no radio) and 7700 (emergency). This alerts ATC that the aircraft is declaring an emergency and does not have an operable radio.

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Squawking 7500 signifies an aircraft being hijacked and could result in an aircraft being escorted by military forces.

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Generally, aircraft requesting that they not be displayed on Flightradar24 are military aircraft. Some military aircraft, such as various transport aircraft, are visible.

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Squawking 7700 in an emergency 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.

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Tracking the Antonov An-225: the world's largest cargo aircraft.

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Also if you see a grey (dotted) line of the aircraft it is an indication that the aircraft is out of coverage of the ADSB recievers and the system is then plotting the expected trajectory for that flight.

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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.

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If the 7500 squawk code is mistakenly selected, the pilot will immediately receive a call from air traffic control asking for confirmation. At this point, the pilot in command or the first officer is able to inform the transponder code has been used by mistake, and that there is no hijacked aircraft.

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7000. ICAO. VFR standard squawk code when no other code has been assigned. EASA countries. Code that pilot shall set when not receiving air traffic services, unless otherwise prescribed by the competent authority.

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7777. US, Germany, Belgium, Netherlands. Non-discrete code used by fixed test transponders (RABMs) to check correctness of radar stations (BITE). US. DOD interceptor aircraft on active air-defense missions and operating without ATC clearance in accordance with FAA Order 7610.4.

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“Squawk 1234” means to just dial 1234 into your transponder. The ATC radar will show the controller that number in the tag associated with your plane. If the tell you, “squawk 1244 and ident”, you should put in the code first, and then press and release the Ident (or ID) button on the transponder.

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The color of the flight path is related to the aircraft's altitude. Red is used for altitudes above ~43,000 feet.

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