RadarBox reads the callsign set by the Flight Crew in the aircraft. If the Flight Crew don't put the callsign into their ADS-B box, then you won't get a Flight ID showing. Different companies have different requirements, so you will see differences between airline fleets.
Also, if there is no Flight ID (callsign) set by the pilots, then there will be no company logo as this is based on the Flight ID.
