THE TURN

In the first Act of "LAX, Part One," this happens:

[The Previously on Lost ends with the detonation of the bomb - then cuts to the clouds, as the view zooms out to Jack. Jack is then interrupted by Cindy.]
CINDY: So how's the drink?
JACK: Uh... it's good.
CINDY: That's not a very strong reaction.
JACK: Well, it's--it's not a very strong drink.
[She hands Jack a single Vodka bottle.]
CINDY: Don't tell anyone.
JACK: It'll be our secret.
[As Jack pours the Vodka into his drink, the plane shakes causing him to spill a little. Jack buckles his seatbelt.]
CINDY: [Over P.A.] Ladies and gentlemen, the captain has turned on the "fasten seat belts" sign.
[Rattling stops.]
CINDY: [Over P.A.] Please return to your seats and keep your seat belts fastened.
ROSE: It's normal. My husband said the planes want to stay in the air.
[Jack chuckles.]
JACK: Sounds like a smart man.
ROSE: You be sure and tell him that when he gets back from the bathroom.
JACK: Well, I'll keep you company until he does. Don't worry--
[The plane starts to shake again, this time more violently. Luggage falls from the overhead compartment and Jack grips his seat, almost in anticipation. The turbulance ends and Jack breaths a sigh of relief.]
ROSE: You can let go now.
[Passengers murmuring.]
ROSE: It's okay. You--you can let go.
[Jack let's go and sighs.]
JACK: Looks like we made it.
ROSE: Yeah. We sure did.
[Bell dings.]

In the previous story, the plane does not survive the turbulence and it crashes on the island.

But in this scene, the plane does not crash. It lead to many viewers thinking that LOST was a) jumping the shark; b) introducing another sci-fi element in parallel universes; or c) giving us clues that the what we had previously seen was not true (like reworking a dream over and over again) or d) that the atomic bomb somehow re-set the time line so the plane would not crash.

But in retrospect, there are several key elements in this short scene that have great import in trying to understand the big premise.

What does Cindy represent?
What does Rose represent?
Why are they comforting Jack, who is a man used to pressure situations?

We know that Rose has terminal cancer. She has come to terms with her fate, that she was going to die.

We know that Cindy represents as a flight attendant, a kind person who works in the sky, which could symbolize a guardian angel.

We would learn later that Jack would have his inner demons tear a part his soul in fits of rage, addiction and regret. Perhaps, this is the point in time where Jack actually dies.

Instead of walking into a tunnel of light, Jack is rocked and jolted into "letting go" by a kind and wise older woman who herself is on the ride to the other side.

And so this flight is merely symbolic of Jack and the other soul's journey into the after life (as represented by the sideways world). The transition period of not truly understanding one's own death is the key to inner peace that is required in the sideways world in order to "awaken" one's spirit to move on to heaven.