And two phases to each of them.
But you're jumping ahead of Part 2. Advent 1 had a private phase and later on a public one.
In this second advent, the Messiah will come privately for His saints, then after the marriage feast with His Bride, He will return with His saints, and every eye will see Him.
You have posted an opinion, probably the opinion taught to you by your religious organization or endorsed by them. Can they show you what Paul taught the Thessalonians, to which he referred in the 1 Thess letter? Well, no they have no more clue than you or I, except we can piece together a likely list of things because we have Paul's other letters and the 2 Thess letter.
Also, if you read your Bible carefully, you will notice that Paul says 'the dead in Christ rise first (at the Rapture event), then the alive remaining folks IN CHRIST are caught up together with the suddenly risen members of the EKKLESIA into the clouds to meet the Lord in the air. ... The Bride goes to meet the Bridegroom.
A proper reading of Revelations reveals the Bride of Christ returns with HIM at the end of the Tribulation. The dead both great and small are resurrected at the end of the Age of the Reign of Christ and His bride, to face judgment and be sorted. IF you want to be in that last crowd, just keep poo pooing the Rapture and scoffing at God's Word, you'll strive right into the Great White Throne of Judgment.
A careful reading of Daniel 9 also reveals a gap between Messiah's First coming and HIS return to deal finally with Israel. The gap ends and evangelization upon the Earth is then tasked to JEWS who then know precisely when Messiah will set foot again upon the Earth, at the end of the 7 years of Jacob's Trouble.
Here is a resource where you can begtin to educate yourself on The Rapture. Maybe we will see you in the clouds even yet!
Would THESE be the Dead in Christ?