A Flightradar alkalmazásban miért vannak kék színű repülőgép-ikonok is? Miben jelent mást, mint a sárga?

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. Space-based ADS-B tracking will be used to supplement our terrestrial receiver network.

Yellow: Aircraft displayed as yellow icons are being tracked via our terrestrial receiver network or are in an estimated position.

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.