Movies such as Flightplan are hell to review. How do I explain, exactly, why the film doesn't work without giving away the plot secrets that prevent it from working? Like last fall's already-forgotten The Forgotten, director Robert Schwentke's airborne thriller involves a missing child. During a trans-Atlantic flight from Berlin to America, Jodie Foster's newly widowed Kyle lays her six-year-old daughter Julia (Marlene Lawston) down for a nap, falls asleep herself, and wakes to find the girl missing. Obviously, escape from the plane is impossible, but Julia is nowhere to be found, and, more disturbingly, no one on the flight seems to remember her being aboard. Could Julia have merely been a figment of Kyle's imbalanced imagination?