I'm glad that this story notes the elevated isotope detection levels last year and the possibility that the US detection plane sent up around that time may have been doing some classified investigation of evidence of an engine of this sort. The article sadly (I mean, of course, but still sadly) has nothing conclusive or very new to say on that topic, but it's still interesting to see others are also curious about whether there's a link.<p>Makes me wonder also, though probably a lot less likely of a link, about the other story run by thedrive recently of the released FAA and ATC conversation regarding the unknown, fast moving, large white airplane-like craft that wandered up the west coast late last year.<p>I'm not sure if an infinite range nuclear-reactor-containing "cruise missile"'s visible characteristics would necessarily be "missile-like", i.e. a cigar with small fins, or if it could reasonably at that point just be... an airplane. It would be ballsy as hell for a Russian experimental nuclear-missile-plane to fly deep deep into American airspace in a common corridor with civilian commercial airliners, like, that would seem to be way too far into an insane possibility that would demand a war-like response, and it's far likelier to have been a US craft from a base in the region, but... it would really be the <i>ultimate</i> test of the system's penetrative and evasive capabilities, if it were such a thing.<p>What do other folks think?