What does the title "Beast from Air" refer to?
It refers to the sow's head, which hangs on a sharpened stick in the open air of the clearing.
It refers to the dead pilot who drifts down through the air to the island with his parachute.
It refers to the snake-like things that dangle in the air above the boys all along the edges of the jungle.
It refers to the threat of isolation and devolution that hangs in the air and threatens to collapse on the boys at any moment.
It refers to the smoke of the cooking fire that rises up into the air and lures the beast towards their camp.