The Beast from Air is the dead body of an airman, attached to a parachute, who descend to the island from an aerial battle which took place ten miles above the island. He is the proof that life is going on in the world outside. He is essentially the message from the world of adults which Ralph had wished for. Unfortunately he was a message which was misread. The body should have reinforced Ralphs message of keeping a fire going in order to get rescued, by reminding the boys of the existence of the world beyond the island. But the body was mistaken for the beast, which undermined Ralph's authority and turned the boys thoughts inwards and away from the outside world and the possibility of rescue.
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Ralph and Piggy, in the end of the chapter Beast from Water, are talking about how they hoped there was a signal from the grown-ups. This signal appears in the form of a dead pilot dragged by his parachute onto the island. The boys begin to fear this signal of the grown-ups, and in a way fearing all of society and civilization. They turn into savages and hunt, fearing and hating this so-called beast.
sam and Eric
How to go about hunting the beast.
Jack said "Bollock to the rules" during the meeting in chapter 5: Beast From Water. Later, at the meeting in chapter 6: Beast From Air, Jack said, when talking about some of the other boys "...It's time some people knew they've got to keep quiet and leave deciding things to the rest of us---."
The identical twin brothers are called Sam and Eric, or Samneric for short, not Simon and Eric. In chapter 6: Beast From air Samneric simultaneously describe the beast, and I quote.... "It was furry. There was something moving behind its head--wings. the beast moved too---" "that was awful. It kind of sat up---" "There were eyes---" "Teeth---" "Claws--" "The beast followed us---" "I saw it slinking behind the trees---"
At the start of chapter 6: Beast From Air there is reference to a battle being fought ten miles up in the air and an explosion followed by a corkscrew trail across the sky. Then a body attached to a parachute (presumably a pilot) drifts slowly down and eventually comes to rest on top of the mountain on the island where the boys live.