Originally Posted by Reaper16
I thought the show made itself pretty damn clear in the finale that the flash sideways was a sort of purgatory -- a holding pattern in which souls of the dead, connected by some strong life experience, could remember what it was that they did on Earth in order to be able to accept it and move on to the afterlife. There wasn't any of this Jack dreaming business.
Exactly. As Red Brooklyn pointed out earlier, "whatever happened, happened". The only part of the entire series that was a figment of anyone's imagination was the flash sideways of the last season, and that was a figment of everyone's
imagination. It was the purgatory that they created together so that as they died at different times, they could help each other find their way to what lies beyond.
Jack did not die in the plane crash. He died from the wounds he received while fighting the Man In Black. What happened, happened.