Acts 8:39 And when they were come up out of the water, the Spirit of the Lord caught away (Lat. Rapiut) Philip, that the eunuch saw him no more: and he went on his way rejoicing.
2 Corinthians 12:2 I knew a man in Christ above fourteen years ago, (whether in the body, I cannot tell; or whether out of the body, I cannot tell: God knoweth such an one caught up (Lat. Raptum) into the third heaven.
2 Corinthians 12:4 How that he was caught up (Lat. Raptus) into paradise, and heard unspeakable words, which it is not lawful for a man to utter.
Revelation 12:5 And she brought forth a man child, who was to rule all nations with a rod of iron: and her child was caught up (Lat. Raptus) unto God, and to his throne.
While 1 Thessalonians 4:17 does not definitively say that just before the Great Tribulation which comes before the thousand year reign of Christ on earth the saints will be snatched away into heaven.
But it does strongly suggest that the “snatching away” is indeed the case.
But when? And to where? “in the air” does not mean “into heaven” but it might be the gathering place (in the air) and then onward to the place He has promised to prepare for us in His father’s house, or an undisclosed place.
I have read that “in the air” was a figure of speech which meant “unknown” akin to shadow boxing an unknown entity.
e.g.
1 Corinthians 9:26 I therefore so run, not as uncertainly; so fight I, not as one that beateth the air:
Or speaking to some unknown person:
1 Corinthians 14:9 So likewise ye, except ye utter by the tongue words easy to be understood, how shall it be known what is spoken? for ye shall speak into the air.
Whatever it means (in the atmosphere – seems most likely) or into heaven or some undisclosed place, it provides an escape from
..the day of the Lord so cometh as a thief in the night…
Followed by the “sudden destruction cometh upon them, as travail upon a woman with child; and they shall not escape”. (But we will who are caught up with Him in the air).
For he then says
But ye, brethren, are not in darkness, that that day should overtake you as a thief.
5 Ye are all the children of light, and the children of the day: we are not of the night, nor of darkness.
11 Wherefore comfort yourselves together, and edify one another, even as also ye do.
Not “terrify yourselves” or “beat each up verbally” but comfort and edify one another with these words.
We are the children of God and we will be caught up "in the air" to meet the Lord and the saints He brings with Him to escape this "sudden destruction".
Now concerning “the Trump of God which will sound when this happens?
For the Lord himself shall descend from heaven with a shout, with the voice of the archangel, and with the trump of God: and the dead in Christ shall rise first:
And in another place:
1 Corinthians 15
51 Behold, I show you a mystery; We shall not all sleep, but we shall all be changed,
52 In a moment, in the twinkling of an eye, at thelast trump: for the trumpet shall sound, and the dead shall be raised incorruptible, and we shall be changed.
53 For this corruptible must put on incorruption, and this mortal must put on immortality.
Admittedly the “trumpet” is problematic if it is identified with the trumpets of the Revelation. But it does not have to be. It is the “last” trumpet that the redeemed will hear and not necessarily related to the trumpets concerning the wrath of the Lamb as we are not the children of wrath and we are not appointed unto wrath.
HankD
which is not good. 
