To Just-me, You made a good observation in Lk.21:20-24 Luke tells of the destruction of Jerusalem in 70 ad, ,then Lk. tells of the Rapture of the church in vs,25-28, then the sign of Israel's restoration as the last generation before the Rapture. SO, in v24 is the end of this church age , when the gentile rule over Israel is fulfilled and the Gospel has brought in the last of the Gentiles to be saved, Romans11:25"..blindness has happened to Israel until the fullness of the Gentiles has come in" . then the rapture happens in Lk.21:25-28. in Mt.24:15-22 we see the antichrist in the temple,during the last days, the latter days, ,the 70th wk. of Daniel. In Mt.24:27-34. we see the rapture of the Church. More to follow, love to all, Hoffco
Actually Luke 21:25-28 is a reference to the Second Coming. Not the Rapture. Here is why.
If we take a look at the context in Luke 21. Then it becomes clear that what is being referenced in Luke 21:25-28.
Let's have a look at more of the passage though:
21 Then let them which are in Judaea flee to the mountains; and let them which are in the midst of it depart out; and let not them that are in the countries enter thereinto.
22 For these be the days of vengeance, that all things which are written may be fulfilled.
23 But woe unto them that are with child, and to them that give suck, in those days! for there shall be great distress in the land, and wrath upon this people.
24 And they shall fall by the edge of the sword, and shall be led away captive into all nations: and Jerusalem shall be trodden down of the Gentiles, until the times of the Gentiles be fulfilled.
25 And there shall be signs in the sun, and in the moon, and in the stars; and upon the earth distress of nations, with perplexity; the sea and the waves roaring;
26 Men's hearts failing them for fear, and for looking after those things which are coming on the earth: for the powers of heaven shall be shaken.
27 And then shall they see the Son of man coming in a cloud with power and great glory.
28 And when these things begin to come to pass, then look up, and lift up your heads; for your redemption draweth nigh.
29 And he spake to them a parable; Behold the fig tree, and all the trees;
30 When they now shoot forth, ye see and know of your own selves that summer is now nigh at hand.
31 So likewise ye, when ye see these things come to pass, know ye that the kingdom of God is nigh at hand.
32 Verily I say unto you, This generation shall not pass away, till all be fulfilled.
33 Heaven and earth shall pass away: but my words shall not pass away. - Luke 21:21-33 (KJV)
You see Hoffco, verses 25-28 in Luke 21 parallel with Matthew 24:29-31. So that passage must be referring to the Second Advent of the Lord Jesus Christ where He comes to the earth to Judge the Nations. (See Matthew 25:31-46).
The Rapture happens before the time of Jacob's trouble. While the Second Coming happens immediately after the time of Jacob's trouble.
One way to know that the Body of Christ is in Heaven before the time of Jacob's trouble starts is to notice that the four and twenty elders are crowned already (in Revelation 4:10 & 5:8-10) before the antichrist is released in Revelation 6:2).
Check this out:
4 After this I looked, and, behold, a door was opened in heaven: and the first voice which I heard was as it were of a trumpet talking with me; which said, Come up hither, and I will shew thee things which must be hereafter.
2 And immediately I was in the spirit: and, behold, a throne was set in heaven, and one sat on the throne.
3 And he that sat was to look upon like a jasper and a sardine stone: and there was a rainbow round about the throne, in sight like unto an emerald.
4 And round about the throne were four and twenty seats: and upon the seats I saw four and twenty elders sitting, clothed in white raiment; and they had on their heads crowns of gold.
5 And out of the throne proceeded lightnings and thunderings and voices: and there were seven lamps of fire burning before the throne, which are the seven Spirits of God. - Revelation 4:1-5 (KJV)
The four and twenty elders are already crowned in Revelation 4:4, which means the Judgment Seat of Christ has already taken place.
Also note that this is before the antichrist is released (Rev. 6:2).
Therefore Revelation 4 affirms that the Body of Christ is in Heaven before the time of Jacob's trouble begins.
6 And before the throne there was a sea of glass like unto crystal: and in the midst of the throne, and round about the throne, were four beasts full of eyes before and behind.
7 And the first beast was like a lion, and the second beast like a calf, and the third beast had a face as a man, and the fourth beast was like a flying eagle.
8 And the four beasts had each of them six wings about him; and they were full of eyes within: and they rest not day and night, saying, Holy, holy, holy, Lord God Almighty, which was, and is, and is to come.
9 And when those beasts give glory and honour and thanks to him that sat on the throne, who liveth for ever and ever,
10 The four and twenty elders fall down before him that sat on the throne, and worship him that liveth for ever and ever, and cast their crowns before the throne, saying,
11 Thou art worthy, O Lord, to receive glory and honour and power: for thou hast created all things, and for thy pleasure they are and were created. - Revelation 4:6-11 (KJV)