And the seven angels which had the seven trumpets prepared themselves to sound. Rev 8:6 This is the beginning of the Great Tribulation.

And when the seven thunders had uttered their voices, I was about to write: and I heard a voice from heaven saying unto me, Seal up those things which the seven thunders uttered, and write them not. Rev 10:4 The Lord does not enjoy passing judgment and administering punishment.     But, He must do it because of His righteous integrity.      Accordingly, He does not want this very ugly picture to be recorded and so propagated.

And the angel which I saw stand upon the sea and upon the earth lifted up his hand to heaven, Rev 10:5

And sware by him that lives for ever and ever, who created heaven, and the things that therein are, and the earth, and the things that therein are, and the sea, and the things which are therein, that there should be time no longer: Rev 10:6 It is the absolute End Of The Age.     There will be no further delay.

But in the days of the voice of the seventh angel, when he shall begin to sound, the mystery of the Lord should be finished, as he has declared to his servants the prophets. Rev 10:7 The Mystery Of The Lord is His Plan to produce children who are born of His Holy Spirit and Word and so are gods.

For as the lightning comes out of the east, and shines even unto the west; so shall also the coming of the Son Of Man be. Mat 24:27 physical lightening is visible for miles.     The brightness of His coming will illuminate the whole earth instantly.

For wheresoever the carcase is, there will the eagles be gathered together. Mat 24:28 The earth is effectively dead under wickedness and rebellion.     The angels come to pour out judgment.

Immediately after the tribulation of those days shall the sun be darkened, and the moon shall not give her light, and the stars shall fall from heaven, and the powers of the heavens shall be shaken: Mat 24:29 The Day Of The Lord has come.

And then shall appear the sign of the Son Of Man in heaven: and then shall all the tribes of the earth mourn, and they shall see the Son Of Man coming in the clouds of heaven with power and great glory. Mat 24:30

And he shall send his angels with a great sound of a trumpet, and they shall gather together his elect from the four winds, from one end of heaven to the other. Mat 24:31 For the Lord Himself shall descend from heaven with a shout, with the voice of the archangel, and with the trump of the Lord: and the dead in Christ shall rise first: Then we which are alive and remain shall be caught up together with them in the clouds, to meet the Lord in the air: and so shall we ever be with the Lord.     - 1Th 4:16,17

But I would not have you to be ignorant, brothers, concerning them which are asleep, that you sorrow not, even as others which have no hope. 1Th 4:13 We must learn to see physical death as graduation from the primitive to the advanced.     When we do so, the sorrow passes quickly with the knowledge of the glory they have entered.

For if we believe that Jesus died and rose again, even so them also which sleep in Jesus will the Lord bring with him. 1Th 4:14 Our resurrection is assured by Christ Jesus resurrection.

For this we say unto you by the word of the Lord, that we which are alive and remain unto the coming of the Lord shall not come before them which are asleep. 1Th 4:15 The resurrection will happen at the return of the Lord.      The dead in Christ will rise first, then those who are alive and remain will be taken.

For the Lord himself shall descend from heaven with a shout, with the voice of the archangel, and with the trump of the Lord: and the dead in Christ shall rise first: 1Th 4:16 The trumpet will herald the appearance of Jesus in the air and the dead and alive In Christ will be caught up to Him..

Then we which are alive and remain shall be caught up together with them in the clouds, to meet the Lord in the air: and so shall we ever be with the Lord. 1Th 4:17 We meet the Lord while He is in the air above the earth and we will never be separated from Him.

In a moment, in the twinkling of an eye, at the last trump: for the trumpet shall sound, and the dead shall be raised incorruptible, and we shall be changed. 1Co 15:52 When the Last Trump sounds the dead in Christ shall be raised and translated along with those who are alive.      This will happen in a moment of time.

And I saw thrones, and they sat upon them, and judgment was given unto them: and I saw the souls of them that were beheaded for the witness of Jesus, and for the word of the Lord, and which had not worshipped the beast, neither his image, neither had received his mark upon their foreheads, or in their hands; and they lived and reigned with Christ a thousand years. Rev 20:4 At his appearing the dead in Christ are raised to incorruption as well as we which are alive.     Together with the Lord we will reign for 1000 years on this earth.

So, we see that the Last Trump is the seventh trumpet of those that were blasted by the seven Angels.   

Rev 10:4 occurs after the sixth trumpet sounds.   It likely obscures the terror of the angels who come and reap the Tares from off the face of the Earth, bind them in bundles and burn them.   

Rev 10:5,6 occurs after the seven thunders are uttered in the sixth trumpet.   It tells us that there should be delay no longer.   Delay of what?   The Return of Jesus Christ marking the end of the age and establishment of the Millennial Kingdom.   

Mat 24:27-31 is Jesus own words which says His appearance will be after the tribulation of those days.   Every eye will see Him.   He will send His Angels to reap the Wheat from the Earth,

1Th 4:13-17 reveals that the Lord Himself will descend with the trump of God and that we will be caught up to meet the Lord in the air and so shall we will ever be with Him.   

1Co 15:52 is how this event will appear to the dead in Christ and those alive as the Angels reap the Earth.