Monster?

lol, the whole premise of the movie is that Sara's boyfriend Bruce has some sort of psycho powers that activate when he gets scared and cause whatever situations he imagines to manifest. Before boarding the plane, Sara had given Bruce a rare comic book with a story about a disastrous plane ride where a monster kills the entire crew. I guess we're to believe that Bruce read the comic and got the idea of a monster attacking them in the air, he was scared to get on the plane from the very beginning [he is traumatized because his parents died in a plane crash] so his mounting fear caused the story in his mind to come to life.

I think what's causing so many people's confusion with this movie is the fact that it starts out as one of those disaster/survival type movies and then suddenly changes to a lame sci-fi/monster ending. That type of change is just so uncommon, alot of people aren't liking it, lol.

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Hey Jin! You better not be cheating on me!!

Well this kind of beastie isn't unknown in fiction and, some claim, fact:

http://en.wikipedia.org/wiki/Atmospheric_beast

Also I'd recommend ACD's "Horror of the Heights" (public domain so it is free to read) or Google "air kraken."

There is even this real (allegendly) account:

Perhaps the only modern account of a sky predator attack on humans was presented by best-selling author Charles Berlitz in his 1989 book, The Dragon’s Triangle. Berlitz retells the story of a doomed aircraft, an account he attributes to researcher Robert Coe Gardner. According to Gardner, a military transport plane took off from the San Diego Naval Air Station late one afternoon during the summer of 1939. Several hours later over the Pacific, the plane transmitted a desperate SOS, then fell silent. The stricken aircraft made it back to San Diego and managed an emergency landing.

After touchdown, ground personnel were horrified to discover that 12 of the 13 men on board were dead. The sole survivor-the copilot-died several minutes later. Reportedly, all the bodies exhibited massive, gaping wounds, and the exterior of the craft was badly damaged and torn open in places. It was also soon determined that the pilot and copilot had emptied their pistols at some unknown target. The whole episode was quickly hushed up, and Gardner would not hear of it until 1954.

Maybe its just me and I don't know if the director was influenced by him, but the monster actually seemed very Lovecraft-ish.
The film wasn't great, but for a popcorn flick on a Friday night it wasn't too bad.

If it produced a gas like helium inside of it's enormous bulbous body then it possibly could float like a balloon.

That said there's really nothing to eat up there so it would starve which makes this a stupid story.

Also how the hell would it survive in dense clouds full of lightning? Too much doesn't make sense about it so they had to go with the kid made it happen.

For all we know, it never happened. All just a dream the little guy had while falling asleep in the airplane.