There is no rapture. When JESUS returns, The LORD'S Day is here on earth. We gather back to CHRIST at the Trump Of GOD, which is the Seventh and last trump.
2Th 2:1 Now we beseech you, brethren, by the coming of our Lord Jesus Christ, and by our gathering together unto him,
2Th 2:2 That ye be not soon shaken in mind, or be troubled, neither by spirit, nor by word, nor by letter as from us, as that the day of Christ is at hand.
2Th 2:3 Let no man deceive you by any means: for that day shall not come, except there come a falling away first, and that man of sin be revealed, the son of perdition;
2Th 2:4 Who opposeth and exalteth himself above all that is called God, or that is worshipped; so that he as God sitteth in the temple of God, shewing himself that he is God.
And GOD is against those that teach HIS children to fly to save their souls:
Eze 13:19 And will ye pollute me among my people for handfuls of barley and for pieces of bread, to slay the souls that should not die, and to save the souls alive that should not live, by your lying to my people that hear your lies?
Eze 13:20 Wherefore thus saith the Lord GOD; Behold, I am against your pillows, wherewith ye there hunt the souls to make them fly, and I will tear them from your arms, and will let the souls go, even the souls that ye hunt to make them fly.
And the 'nor by letter as from us' that Paul is talking about is 1st Thessalonians. Paul is saying don't be confused by that letter. If you know how to read 1st Thessalonians, you will see easily that it is not speaking of a rapture.