FlightRadar24 blue and yellow planes

why are flight radar24 some planes are blue most are yellow?

Blue planes are tracked by satellite.

The blue planes are being tracked by satellite

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Blue aircraft are satellite tracked planes I believe.

More information here : https://www.flightradar24.com/blog/satellite-based-ads-b-data-now-available-to-all-flightradar24-users/

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