I believe the rapture will happen at the end of the tribulation period, the last 7 years till the end. Those that think it can happen anytime are in error.
The rapture will probably happen shortly after the two witnesses in Revelation are raised from the dead and raptured up.
I am inclined to believe that the ufo aliens are the angels of God, and ufos are the same as the charriots of fire in the old testament. So, if this is true the second coming of Jesus will be a ufo invasion, with ufos piloted by angels, coming at the earth from all directions at once. The dead Christians will be reunited with their physical bodies and the Christians that are alive will be changed. Then the rapture happens and the resurrected dead and the living Christians will be levitated up to meet the Lord in the air, probably to join angels inside of ufos.
Then the Lord and the angels and saints will come back down and destroy the armies of the Earth at armageddon in the land of the middle east. The angels will be sent out to gather the sinners and throw them in hell. Then Jesus will set up His kingdom on earth, ruling and reigning with his saints for a thousand years.
That is how I see it happening according to scripture up to the time of the millenial reign of Christ.
I believe the Ezekiel chapter 38 and 39 prophecy must happen even before the tribulation period starts. So it looks to me like the rapture is a long way off.
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In 1827 Darby left the Anglican priesthood and by 1831 was among the leaders of the Plymouth Brethren, a non-denominational movement which denounced mainline Christianity. He began to teach that the true church would need to be removed from the earth in order to make way for the completion of God's dealings with the Jews. He named this secret removal of the church the Rapture. This belief was something completely new in Christianity. No previous Christian, neither Catholic nor Protestant, had ever proposed or taught such an thing.