Is there radar survalance data accessible for aircraft which have their transponder turned off???
https://www.thedrive.com/the-war-zone/13154/this-mysterious-military-spy-plane-has-been-flying-circles-over-seattle-for-days
This Mysterious Military Spy Plane Has Been Flying Circles Over Seattle For Days
Nobody seems to know who specifically the aircraft belongs to or what it's up to, but based on its configuration, its capabilities are pretty clear.
By Joseph Trevithick
Russell Hill- Sabian404 at Flickr
A very unique USAF surveillance aircraft has been flying highly defined circles over Seattle and its various suburbs for nine days now. Nobody at the DoD seems to know who the aircraft belongs to or what exactly it is doing flying so many missions over the Seattle area. But based on its visibly exotic configuration, and information collected by open source flight tracking websites, we can get a good idea of its capabilities and guess as to what it’s up to.
The aircraft, which goes by the callsign “SPUD21” and wears a nondescript flat gray paint job with the only visible markings being a USAF serial on its tail, is a CASA CN-235-300 transport aircraft that has been extensively modified for the surveillance mission.
Could have been planted