Please explain this phenomenon, which I caught on the sky about 10 km from Kielce.
It looked like a chemtrails plume, but .... black.
When I was near Kielce the streak was exactly over Kielce.
In fact, from a closer view, the plume looked like black smoke from a chimney trailing across the sky.
I don't think the light streaks darken with dusk.
Perhaps you have an explanation for this phenomenon?
English 
Polish
Because it is " black chemtrails "
https://mobile.twitter.com/JTTsteve/status/1457002072038121473
Thanks, Brother.
By the appearance of the streak momentary ascent is some kind of military ship, some kind of fighter, it looks like a single-engine there are no proportions visible so the mig could also be and in good shape because it is not long this trace.