The disaster in this film is that a loose bolt in the plane's tailfin elevator
gets under the mechanism jamming it up. they fly in to a storm and then experience a supernatural being in the air that is out to kill them. This entity seems to be in the imagination of the pilot's boyfriend. They discover this because she bought him a copy of a comic where the whole plot is drawn out. I know, it is bizarre. I was totally confused during the film. It mixes so many elements and doesn't really do any story element justice. There is some hint of love between the single guy and the drunk's girlfriend. But he drops from the plane in an attempt to fix the elevator.
I can't really recommend this film.