Prince Of The Air

Ephesians 2:1-2 (ESV)

1 And you were dead in the trespasses and sins 2 in which you once walked, following the course of this world, following the prince of the power of the air, the spirit that is now at work in the sons of disobedience.

Revelation 12:9 (ESV)

And the great dragon was thrown down, that ancient serpent, who is called the devil and Satan, the deceiver of the whole world—he was thrown down to the earth, and his angels were thrown down with him.

The devil and his angels are thrown down to the earth. He has become the prince of the air and deceives the whole world. The air refers to the breath of mortal man. It is the life of all creatures of the earth, the underworld of those dead to God and walk in the darkness of death. 

The world of man is chained to death through deception, but is freed by the truth of God. The darkness recedes in the morning light.