Red: When an aircraft is displayed as red that means that you are currently following that specific aircraft on the map or that an emergency squawk is on for this aircraft.
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Flightradar24 is the first flight tracking service which offers space-based ADS-B-tracking. The blue planes on the map are tracked from a satellite and the yellow ones are tracked from the regular earth-based radar stations.
A plane may choose to turn off their transponder. Military aircraft in particular are exempt from many civil rules and regulations which would see most aircraft having an active transponder and of course their operational requirements will dictate they often do.
Some high profile aircraft, such as Air Force One are not displayed. Most other aircraft subject to restriction are shown as anonymized by aircraft type.
Generally, aircraft requesting that they not be displayed on Flightradar24 are military aircraft. Some military aircraft, such as various transport aircraft, are visible. How do I see only a military plane on Flightradar24? In Flightradar24, you normally cannot see military planes, they're filtered out.
The position is calculated based on many different parameters and in most cases it's quite accurate, but for long flights the position can in worst cases be up to about 100 km (55 miles) off. In settings there is an option to set for how long time you want to see estimated aircraft on map.
Restricted aircraftOperators of private or sensitive aircraft may request their tracking details be restricted or not displayed. Generally, aircraft requesting that they not be displayed on Flightradar24 are military aircraft. Some military aircraft, such as various transport aircraft, are visible.
Blue: Aircraft displayed as blue icons are currently being tracked via satellite. Satellites are collecting the ADS-B signals from aircraft and transmitting them to the Flightradar24 network. Space-based ADS-B tracking will be used to supplement our terrestrial receiver network.
Currently, the bragging rights for the longest flight in the world belong to Singapore Airlines' New York City to Singapore route. Its longest flight path, which connects Singapore's Changi Airport with New York's John F. Kennedy International Airport, 9,585 miles away, takes 18 hours and 40 minutes.
The first emergency code that you may have become familiar with is Squawk 7500. This code is used to indicate that the aircraft has been hijacked, and therefore requires urgent emergency support from both security services and air traffic control.
A Squawk 7700 indicates an emergency. This can be an emergency of any kind. Pilots may input it into the transponder themselves – or when instructed to do so by ATC. As a result, ground control will know that the aircraft is dealing with a serious issue and needs help.
SQUAWKing is the process of communicating between the air and the ground, the process is essential for keeping planes in the air safe and ensuring a smooth and manageable air traffic control process, both for pilots and air traffic controllers.
The most tracked flight consists of 4.79 million trackings and was achieved by ZZ177 RAF Boeing C-17A Globemaster III, carrying Queen Elizabeth II's coffin, from Edinburgh, Scotland to London, England on 13 September 2022.
In the image above, a detailed flight path indicating completed lines (purple), yet to be flown lines (green), and the current status of the aircraft (the square near the center).
Flightradar24 covers all commercial, private, and military aircraft which are equipped with a transponder. The transponder must be switched on and transmitting, and the aircraft must be within range of an air traffic control system.