This is not the Second Coming! It is the Rapture, the gathering in the air that takes the believers out of the way before the antichrist is revealed. The entire argument is over the coming in the air and the Second Coming when He touches down on earth to destroy the anti-christ.
Again, there is only one Second Coming of Christ and that is when HE resurrects the dead and after that gathers His Elect.
1 Thessalonians 4:13-18 is 2 Thessalonians 2:1