Originally Posted by
DaveReidUK
We don't know that FR24 didn't track it.
It may well have a voluntary agreement, as it does with many corporate/private aircraft owners, not to publish flight details.
It is highly likely they did not track it. Yes, there are ways to get you off the radar of these private spy organizations, but if you agree with them, they only hid the aircraft information. I do have such agreement and FR24 does show a generic aircraft symbol without any further information, but does show it. Even further, also the other spy operations around did not record anything, so maybe they flew transponder off?