When the LORD comes in the air, at that time that He brings the 'dead in Christ' with Him, when the trumpets sound twice and the dead in Christ and the living saints receive their regenerated forms of thier human being bodies,, He begins at that time the last thousand year period of time for this present creation. His coming at that time is as a thief in the night and is not, repeat, 'is not' when He plants His feet on the Mount of Olives and defends Jerusalem, destroying the armies of the beast:
When He returns to this earth to set up His kingdom and reign on His throne of glory from the Millennial reign temple as Ezekiel described it -all His enemies will be completely destroyed and removed from this earth, after the seven year great tribulation when the kingdom of the beast is judged- then, and only then, at the end of that time of judgment, does He plant His feet on the land, and the coming is 'one' and is not two, for first He removes His congregation, as Psalm 75:2 tells us, and by that gathering to Himself His own (whom He calls to enter their 'rooms' which He went to the cross to prepare 'them', as a 'dwelling place' for the Father; John 14:1-3), and to shut their 'doors' about them, as Isaiah 26:19-21 tells us, and then the final 'one hour', which is only the first seven years of the 'last day' of the thousand years allowed for this present creation, allows the final confrontation to begin with the revealing of the man of sin after the people who are His people, His congregation, are removed by the 'laqach' -as Enoch was; then, that return to the earth, by planting His feet upon the ground is the completion of the second coming; which is when the kingdom of God comes to this earth and His will is done on earth as it is in heaven, which we are to pray for.
The period of time of the seven years, which is the time of 'Jacob's trouble' and the time of the judging of the kingdom of the beast and the putting to an end the 'mystery of iniquity' on earth that began in the Garden, at the fall, when the wicked one got control of the kingdom that was prepared for the first Adam and the sons of Adam, is called only 'one hour' by the LORD, as the beast is allowed to rise in all his power and is judged by the great judgments that proceed from the throne of the LORD in heaven -where His people are taken to be with Him, out of harms' way, for that entire 'hour', which is also called seven years, and one week, in Scripture.
It is one coming, and the entire seven year period is called the 'Revelation of Jesus Christ', by John, as He received the revelation to show us of the time of the 'Day of the LORD', when He is revealed to the entire world as 'the only potentate, King of Kings and LORD of lords', when He judges the inhabitants of this world, puts an end to the 'generation' of the tares (all the wicked who are born of Adam who receive the lies of the devil and who become sons of wrath by believing and acting upon the lies of the devil, without repentence, who are alive on earth at His coming; and all the 'other' ones, who were born of unlawful unions, as it was in the days of Noah "and also after that...").
His coming begins as a thief in the night, suddenly, without warning or remedy, and His return to rule over His kingdom is seen by every eye in heaven and in earth and under the earth, seven years later, and His rule is for the thousand year reign of peace over this present creation, before He regenerates the heavens and the earth, as told of in Scripture.
Maranatha!