In Unveiling the Apocalypse, I argue that the demonic horde of locusts described in Rev 9 foretold the event of military airplanes and the timing of their first appearance during the First World War.
And the fifth angel blew his trumpet, and I saw a star fallen from heaven to earth, and he was given the key to the shaft of the bottomless pit. He opened the shaft of the bottomless pit, and from the shaft rose smoke of a great furnace, and the sun and air were darkened from the smoke from the shaft. Then from the smoke came locusts on the earth, and they were given power like the power of scorpions. In appearance the locusts were like horses prepared for battle: on their heads were what looked like crowns of gold; their faces were like human faces, their hair like women's hair, and their teeth like lions’ teeth; they had breastplates like breastplates of iron, and the noise of their wings was like the noise of many chariots with horses rushing into battle. They have tails and stings like scorpions, and their power to hurt people for five months is in their tails. (Rev 9:1-10)
These iron-clad flying creatures of war appear at the first woe of the Apocalypse - which I equate with the First World War. The other two woes are two further world wars - the Second World War, and the world war still to come. Together with the Cold War, these are the wars and rumours of wars mentioned by Jesus in the Gospels that were prophesied to take place before the Great Apostasy (where the love of many would grow cold and Christians would fall away from the faith), and the Second Pentecost (when the Gospel would be spread throughout the world before the coming of the end):
"...you will hear of wars and rumors of wars. See that you are not alarmed, for this must take place, but the end is not yet. For nation will rise against nation, and kingdom against kingdom, and there will be famines and earthquakes in various places. All these are but the beginning of the birth pains.“Then they will deliver you up to tribulation and put you to death, and you will be hated by all nations for my name's sake. And then many will fall away and betray one another and hate one another. And many false prophets will arise and lead many astray. And because lawlessness will be increased, the love of many will grow cold. But the one who endures to the end will be saved. And this gospel of the kingdom will be proclaimed throughout the whole world as a testimony to all nations, and then the end will come." (Matt 24:6-14)
The appearance of the locusts on the earth are announced by a star which falls to earth, which I equate with the Tunguska event in 1908 (since the Tunguska event occurred contemporaneously with the US Signal Corps' commission of the Wright brothers to deliver the world's first military aircraft). As well as having metal plating ("breastplates of iron"), these flying "war horses" have teeth like lion's teeth, which I compare to the Shark's teeth nose art found on aircraft such as the Curtiss P-40 Warhawk:
The locusts also have "crowns of gold", which can also be explained by decorative nose art, such as that depicted on the propeller in the image below:
They also have "faces like men's faces", which could be accounted for by the visible face of the pilot in the cockpit.
And the hair like women's hair could also be explained by nose art. Petty girls, often depicted with long flowing hair, were one of the most popular form of nose art during the Second World War.
The noise created by these locusts (the sound of many chariots rushing into battle) also pretty accurately describes the sound made by jet engines.