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Why is 'SPUD21' 66402 orbiting at 17,000 to 22,000 feet over Seattle
[War Zone] 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. You can see more pictures of the aircraft here.
Posted by: Besoeker 2017-08-05
http://www.rantburg.com/poparticle.php?ID=494301