Flying from warsaw to london heathrow, looking out the window to my left. out of the corner of my eyes i saw these dark, thin figures in the middle of a cloud. it definitely wasn't a building because we were too high up so i thought they were mini tornadoes there were 4 figures: 2 tall ones and 2 slightly small ones. they were very close together and they weren't moving at all. they were dark, had a thicker upper body and a thinner lower body. one of them looks like they had wings. i was in awe and shocked at how it was all deserted then there were these random weird objects just standing on top of a cloud. i took photos and showed my parents and brother the photo and they couldn't believe their eyes. i was also a little bit excited because i have never seen anything like this before. flew past the object(s) then it disappeared.