WHOOOSH to the island as Jack's body is washed out of the cavern by the stream. He's still alive but bleeding badly. He staggers to the bamboo forest and lies down. He hears something and turns to see Vincent run over to him, just as he did the very first day Oceanic 815 crashed on the island. Jack stares up through the swaying bamboo and hears something else. Distant. Up in the sky. And then he sees the Ajira plane climb higher and higher. Jack watches as it flies away.
He smiles. The plane is gone, finally free of the island. Jack Shephard has done what he came to this place to do. He has found his purpose. He has found love. And been loved. And he has finally found a way to love himself. The bamboo sways across the blue sky. And Jack Shephard's eye closes one final time. He is gone.