It would be preferable to be stuck on a transatlantic flight with a screaming infant than to sit through 90 minutes of a one-note Foster running amok on a 747. In a movie sharing the same plot as Alfred Hitchcock's The Lady Vanishes, Foster is a recent widow taking her 6-year-old daughter and husband's coffin from Germany to New York. Mom falls asleep and when she wakes, her little lady is gone.
For a good chunk, the film is actually interesting, though not riveting, as the reasonable question is raised that the grief-stricken Foster has simply imagined her daughter accompanying her. The possibility is buttressed by a passenger manifest that omits the girl, testimony of travelers and stewards who don't remember seeing her, and a note from the German morgue saying the daughter died when Dad dived off the apartment roof holding her.
But then it becomes clear that a scheme is afoot and the movie shifts gears from psychological thriller to inane action pic. The plot becomes thinner than the air at 30,000 feet, and without giving anything away, look for the extra who comes onscreen at the end to deliver a single line of dialogue meant to close one of the many plot holes.