Something black appeared and it was a kind of object with two long thread in back color

On 4th of March i was travelling from Palma In Ryan Air Flight which departed from Palma de Mallorca at around 9:00 am in the morning. Between 10:10 to 10:30 am i was looking outside the window and i saw something in black appeared it was a kind of object with two thread or tails .. Initially in thought its some kind of smoke but it then it moved upwards very fast.. means really fast. Then this Triangle shaped object became flat and then moved down and came back up.....as i was continuously watching it. It became still as if its a cloud of back colour.
Now after 15-20 minutes it again appeared and pattern was same. just at the last moment it clicked into my mind to make a video. I am uploading the video as well. The passenger sitting at my back seat also saw this and we spoke about this.. Even he showed it to his wife but again they were not sure what it was .. and their comments were as if could be an alien and then we laughed.
I think i should report this but again am not sure what it was.. I hope reporting this video will not cause any trouble for me..