J.C.
A couple of small new toys that she hasn't seen. Make sure you bring a small blanket for her because you don't want to use the ones on the airplane. (reused and reused) Also wear her out before the flight. Let her play hard so she will be tired for the flight. You might also want to bring an empty sippy cup and ask the flight attendant if they can put some apple juice mixed with water in it before the flight takes off. I helps their ears if they can drink during takeoff and landing.