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“Callsign” is not registration (”N number”) or “Flight #”...those “flight tracker” sites (”Flight Aware”, “FlightRadar24”, “ADSBexchange.com”(his) just use ADS-B info. to track flights... ADS-B includes “tail#/N-number” or “flight number”. ATC and pilots use “callsigns” for radio comms...things like “Speedbird” (British Airways), “Critter” (ValuJet), “Cactus” (certain US Air flights in the past, i.e. “Miracle on the Hudson” (inherited from America West Airlines from before the merger(s)) and “Air Force One”. ADS-B can be turned off all together, or the “tail #” part can be obfuscated for privacy/security. Military flights do it frequently for “OpSec”. The “ADSBexchange” ADS-B site probably just puts “N/A” in there when the ADS-B ground station receiving signal is weak or the aircraft is in “privacy mode”. (Like a lot of the Epstein flights to “Pleasure Island” were).

said, "ADS-B site probably just puts “N/A” in there when the ADS-B ground station receiving signal is weak or the aircraft is in “privacy mode”

military aircraft drop off the radar all together in privacy mode. The signal issue is odd I don't understand that explanation when the tail number and nearly everything else about the plane is showing.

N/A was written in or a default for not showing a callsign. What I'm trying to understand is why a callsign wouldn't get posted in the flight log.