Flightplan - Reaction

Fine suspense film. Starts cinematically beautiful and continues clearly thoughtful use of colors and lighting throughout. Also plays intelligently off the movie The Sixth Sense. But the unexplained plot holes bothered me. If I didn't understand how the villain had everything planned out, how could I properly understand what was going right and what was going wrong? Also, most other characters besides Jodie Foster are not fleshed out -this bothered me-, but it may be intentional.