Job 39:30 AND Matthew 24:28 Job 39:30 AND Matthew 24:28 


  For wheresoever the carcass is, there will the eagles be gathered
  together.


This is scripture regarding Christ's return.  My difficulty is in understanding why this referral to eagles and the dead is made.
I often turn to Biblical commentators when I have questions like this.  In my studies, I have found a few that, in my opinion, are consistently reliable; that is, their thoughts are founded on and derived from their knowledge of the Hebrew and Greek languages; as well as their understanding of scriptural and secular history.  


Albert Barnes https://www.studylight.org/commentaries/bnb/matthew-24.html


"The words in this verse are proverbial.  Vultures and eagles easily ascertain where dead bodies are, and hasten to devour them.  So with the Roman army. Jerusalem is like a dead and putrid corpse. Its life is gone, and it is ready to be devoured. The Roman armies will find it out, as the vultures do a dead carcass, and will come around it to devour it. This proverb also teaches a universal truth. Wherever wicked people are, there will be assembled the instruments of their chastisement. The providence of God will direct them there, as the vultures are directed to a dead carcass."

Adam Clarke  https://www.studylight.org/commentaries/acc/matthew-24.html


"For wheresoever the carcass is - ...the dead carcass. The Jewish nation, which was morally and judicially dead."  
"There will the eagles - The Roman armies, called so partly from their strength and fierceness, and partly from the figure of these animals which was always wrought on their ensigns, or even in brass, placed on the tops of their ensign-staves. It is remarkable that the Roman fury pursued these wretched men wheresoever they were found. They were a dead carcass doomed to be devoured; and the Roman eagles were the commissioned devourers. See the pitiful account in Josephus, War, b. vii. c. 2, 3, 6, 9, 10, and 11."

Thomas Coke  https://www.studylight.org/commentaries/tcc/matthew-24.html


"By the word carcase is meant the Jewish nation, which was morally and judicially dead, and whose destruction was pronounced in the decrees of heaven. Our Saviour, after his usual manner, applies a proverbial expression with a particular meaning: for as, according to the old proverb, wheresoever, &amp;c. so wheresoever the Jews are, there will Christ be taking vengeance upon them by the Romans, who are properly compared to eagles, as the fiercest beasts of prey, and whose ensign was an eagle, to which also probably our Saviour in this passage alluded. And as it was said, so it was done; for the victories of the Romans were not confined to this or that place, but, like a flood, over-ran the whole land. There was no part of Judea that did not partake of the calamities of the captivity. At Antioch many were burnt in the theatre, and others were slain; the Romans slew them every where; at Jardes not fewer than three thousand were put to death. Being on the point of being taken at Masade, they first murdered their wives and children, and then themselves, to the number of nine hundred and sixty, to avoid falling into the enemies' hands. In Cyrene, the followers of Jonathan the weaver were most of them slain; he himself was taken prisoner, and, by his accusation, three thousand of the richest Jews were put to death." 

John Gill  https://www.studylight.org/commentaries/geb/matthew-24.html


"For wheresoever the carcass is,.... Not Christ, as he is held forth in the Gospel, crucified and slain, through whose death is the savour of life, and by whom salvation is, and to whom sensible sinners flock, encouraged by the ministry of the word; and much less Christ considered as risen, exalted, and coming in great glory to judgment, to whom the word 'carcass' will by no means agree, and but very poorly under the former consideration: but the people of the Jews are designed by it, in their fallen, deplorable, miserable, and lifeless state, who were like to the body of a man, or any other creature, struck dead with lightning from heaven; being destroyed by the breath of the mouth, and brightness of the coming of the son of man, like lightning, just as antichrist will be at the last day:
"there will the eagles be gathered together: not particular believers here, or all the saints at the day of judgment; though these may be, as they are, compared to eagles for many things; as their swiftness in flying to Christ, their sagacity and the sharpness of their spiritual sight, soaring on high, and renewing their spiritual strength and youth: but here the Roman armies are intended, whose ensigns were eagles; and the eagle still is, to this day, the ensign of the Roman empire: formerly other creatures, with the eagle, were used for ensigns; but C. Marius, in his second consulship, banished them, and appropriated the eagle only to the legions: nor was it a single eagle that was carried before the army, but every legion had an eagle went before it, made of gold or silver, and carried upon the top of a spear...: and the sense of this passage is this, that wherever the Jews were, whether at Jerusalem, where the body and carcass of them was, in a most forlorn and desperate condition; or in any other parts of the country, the Roman eagles, or legions, would find them out, and make an utter destruction of them."  



There are others I often turn to:  James Burton Coffman, Dr. Thomas Constable, Charles John Ellicott, and Matthew Henry.  

You will note that the four commentators quoted all conclude that Jesus' words were not in regard to our day; but were a description of the destruction of Jerusalem in 70 A.D.  

I encourage you to maintain your interest in these matters!