I'm not sure how much more you can downplay this? it doesn't matter who was controlling the flight. I'm guessing and the 302's backup statements saying they were monitoring the flight. radar range, is not control or they would have to be contacted. 305 without a doubt was in there radar range. I fail to see any reasoning in not believing this as a matter of fact? this was a threat to Portland that you always seem to point out but feel they ignored the plane while on radar? that doesn't make much sense either.....
I've contacted someone else surrounding this issue..
A Former Marine Corps KC-130 Loadmaster and retired Navy carrier based jet pilot, LSO and instructor, (EA-6B Prowler). ATP MEL, and Commercial SEL pilot license. Currently Aerospace Program Manager, part time commercial Cessna 208 Caravan pilot.
I asked him about radar idents/handoff's and the ability of Portland seeing 305 on radar....
It is very easy for the radar operator to know exactly where an aircraft is when it enters their airspace. The plane position tracks live on their scope, and control sectors are depicted on the screen. The only unknown factors in this case are when/where he actually jumped.
Then I told him Portland had nothing to do with controlling the plane but did give information surrounding the plane..
ATC radar sees all aircraft within its coverage area, annotated to indicate who they're talking to, among other things. Handing them off changes that annotation but nothing else.
ATC's job is to keep aircraft safely separated, and they need to see all traffic in their sector, not just the folks they're talking to, to do that effectively. It is somewhat common for one controller to manage aircraft in another's sector, e.g. to avoid two handoffs in a row when clipping the corner of a sector.
At low altitudes, many aircraft won't be talking to anyone at all. ATC still needs to see them so they can vector the folks they are talking to around them.