Why are some aircraft shown as blue, yellow or red on the map? 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.

On Flightradar24 in 2026, aircraft icons that appear in blue indicate that they are being tracked via satellite-based ADS-B (Space-based ADS-B). Standard yellow icons represent aircraft being tracked by terrestrial (ground-based) receivers. The blue icons are particularly significant because they allow for real-time tracking in "dark zones" where ground receivers cannot reach, such as over the middle of the Atlantic Ocean, the Sahara Desert, or the Polar regions. This technology, provided by partners like Aireon, uses a constellation of low-earth orbit satellites to "listen" for aircraft signals from above. When a plane moves from land to sea, you will often see its icon switch from yellow to blue. For 2026 aviation enthusiasts, seeing a blue icon means you are viewing a flight that, only a few years ago, would have been "invisible" on the map for hours at a time during its oceanic crossing.