At 71 minutes in, after Maryam jumps from the airplane wing to sacrifice herself for her brother, he is seen on the ground with his bloodied shirt slashed open but no cut or blood on his chest.
At 71 minutes in, when the two men are fighting on the 'airplane wings' and Maryam is chained by the throat with the men's positioning affecting her choking, the wings' balance constantly changes incorrectly (i.e., when the men are further to the other end, she would be safe as her wing should rise).
At 85 minutes it, the Kurdish woman gouges into the back of his neck an anchor-like symbol; it's on her neck and that of the man with whom she traveled. But on them it was a tattoo, not a knife gouge.
There is no realistic way Mussa could rig up the wing balancing act with Maryam on one end and end up on the opposite end of the wing.