We saw Flightplan today. It was okay (B-). Jodi Foster plays a distraught mom traveling with her 6 year old daughter. They fly on a plain that Jodi helped design, so she knows it well. They are bringing home a casket with the body of her dead husband.
During the flight her daughter is taken, but nobody believes that the daughter was ever on the flight.
So the rest of the movie is devoted to the drama and action surrounding Jodi's hunt for the daughter.
I like Jodi Foster and she is perfect for this type of roll. Anybody weaker would have been unable to pull it off without looking silly.