Invisible aircraft

Punching N1, the FAA’s Gulfstream, into the Flight/Tail No. box gets an ‘INVALID’ response. Never had this before. Does it use a different callsign? I saw the plane but didn’t hear it on the radio.

Dave

N1 through N9 are blocked by the FAA, so we never receive any information about them.

Thanks for that, obviously I am used to seeing ‘This flight is not available for tracking per request from the owner/operator’ but I guess when the owner/operator and information supplier are one and the same different rules apply.

Dave