EDIT: All who will be saved will have been saved before He returns - including the 144,000.
I am saying that - in the End Times Scenario time line - from the moment when He appears until after He is done "dispensing" the Wrath of God upon the 'evil' on the earth, no one will be saved. (This is mainly about the 'evil' not getting another chance - i.e. - 2 Thessalonians 2:12)