Maybe the ff of Kate and Jack at the airport is end of this season and the ff of Jack and Hurley playing HORSE is kind of like a ff right after the getting off the island, so maybe this season is kind of what happens between Charlie (supposely) dying & the ones who did get off the island that maybe wasn't suppose to leave the island.

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Standing in the ocean with the sun burning low in the west
Like a fire in the cavernous darkness at the heart of the beast
With my beliefs and possessions, stopped at the frontier in my chest
At the edge of my country, my back to the sea, looking east