All of this happened in 70 AD. The Great Tribulation was the utter destruction which came upon Israel. Notice that it happened in Judea and was "a time of trouble, Such as never was since there was a nation?" Christ returned and carried out His wrath against apostate Israel, just as He said He would. The dead saints have been resurrected and are in heaven, the place prepared for them. The righteous were "changed" in the twinkling of an eye, their souls given new "programming" not to go to Hades anymore but straight to heaven upon death. That was the rapture, or being caught up "in the air."