This is pretty much just Jodie Foster running around an airplane for 90 minutes.
She and her husband are engineers for this model so she knows exactly where places are in the airplane that she and her daughter take home to the US along with the husband's casket in the hold. Foster sleeps and finds her daughter missing. The captain can't see that the daughter was ever on the plane and the air marshal takes charge of Foster. The captain has called the FBI to come to the place they'll land on the way and the air marshal says Foster is a terrorist.
We see that he has a bomb and the daughter tucked away, sedated, in part of the plane that can only be accessed by a trap door. Foster figures this out, gets out of her handcuffs, and when she gets her daughter, she sees the bomb material and has the remote. She takes her daughter into a different part of the airplane and then sets off the bomb.
All the crew and passengers were already outside, so they think that Foster is a terrorist. But then they see her coming out from the smoke holding her sleeping daughter and they realize she was right. We see her and the passengers in the terminal where the passengers are now saying how brave she is, and then the FBI takes her off in a car.
It wasn't bad, but the plot is pretty thin.