Flightplan (2005)

Jodie Foster plays Kyle Pratt, a recently widowed aircraft designer who must fly her and her daughter back from Berlin to America in order to bury her late husband. When she awakes from a much-needed nap, she realises to her horror that her six-year-old daughter Julia is missing. Kyle initially thinks her daughter may have wandered off, but mild panic turns to full-scale hysteria when after an exhaustive search Julia is nowhere to be found on the plane. More worryingly, it emerges that Julia was never even registered as a passenger on the flight. With no one on board confirming that they had seen her, the audience is left guessing as to whether this is all a figment of Kyle's strained state of mind. Tense action follows as Kyle must rely on her own instincts to save herself and find her daughter.