"The previous bowls have been poured out upon the earth, the sea, the rivers and fountains, the sun, the throne of the beast, and the great river Euphrates. This, the last and greatest, is poured into the air; and immediately there is heard a voice out of the temple in heaven, proclaiming, "It is done!" What, then, is symbolized by the plague poured into the air? Of what is the "air" the emblem? In the Revelation the whole of nature is used as a great complex parable or symbol. What does the atmosphere especially signify? And the answer is not difficult. If earth, sea, rivers, fountains, the sun, a throne, etc., denote manifest spiritual realities, the air obviously would symbolize an invisible spiritual realm. And here we are helped by sundry hints of scripture usage."
Much more in the text:
"When "the prince of the power of the air" is judged and cleansed from the realm of the "powers of the heavens," THAT POSITION IS NOT GOING TO GO UNFILLED. ANOTHER POWER MUST BE RAISED UP INTO THAT VACATED REALM OF DOMINION TO BECOME THE ENERGY FORCE THAT INFLUENCES, AFFECTS, IMPACTS, SWAYS, IMPELS, CHANGES, AND TRANSFORMS THE UNDERSTANDING, CONVICTIONS, DESIRES, AND ACTIONS FIRST OF ALL THE PEOPLE OF GOD, AND EVENTUALLY OF THE INHABITANTS OF THE WHOLE WORLD, GIVING DIRECTION AND MOTIVATION UNTO TRUTH AND RIGHTEOUSNESS!"