It involved an Eastern passenger plane that had miscalibrated it's guidance system and strayed into Soviet(?) territory during a politically tense period at the same time a US spy plane was in the area.
The Russians(?) shot the plane down and it nearly started a war. The country the plane was from didn't believe it had strayed as far as the Russians(?) said it did.
Eventually, the US government released radar data showing the position and path of this plane so that it would avoid a war. It showed this particular plane had grossly gone off course and entered Russian territory. The radar they had was capable of tracking every plane in the world 24x7. This was back a couple/few decades as well! Turned out the plane has set the wrong guidance system pre takeoff which was a terrible and extremely rare mistake. The US held out until the last moment to release this data as they didn't want anyone to know they had the capability.
This leads me to believe some people somewhere know where this plane went down.
I am not sure if I am recalling this precisely, but I 100% remember that the US government back then apparently has this radar tech.