i was surprised

i made that day this photo you have seen because the sky was intens blue probably due to the effect of the pandemic on air quality then, but the thing is, i took the picture from where i was standing with the arms above my head without looking and guessing to get a nice shot of the jetliner,,
so when i had taken the photo i continued to go home.
2 weeks later after uploading the photo's i made then, i discovered this not expected result.
My guess this cylinder is far above the plane, so it's HUGE
There was no direct sun,( which was low on the horizon at that time, see picture) from where i photographed, so it can't be a lensflare.
Since then i started to search on the net to find similar shape's & same dimensions in pictures & movies( 1 russian air force)