Sentinel Chicken
American 71 Heavy, contact departure 126.47
A friend posted this on my forum today, it was taking off from Boeing Field in Seattle. It appears to be an E-3 Sentry but has a tail cone housing for what looks like a VLF antenna (though there's no reason for it to be deployed...could just be one of those flight test attachments for air data) but there are forward fuselage fairings that are much larger in area but seem shallower than what's on the Block 30/35 Sentry aircraft.
I've never seen this Sentry variant......
I've never seen this Sentry variant......