What was the name of this movie?

It came out a few years ago, about a mother and her daughter; the father had died somehow and they were taking the red eye flight to another city, transporting the body in a coffin in the plane as well. The mother was a technician who helped with the design of the airplane and I think it had two floors - that detail is a bit iffy on my part though...

the mother falls asleep or goes to the bathroom for a moment and when she wakes up/returns from bathroom break, she realizes that her daughter is missing. She starts to panic when she asks people around her who say that they haven't seen her daughter and that she must just be hallucinating - the flight attendants can't find any record that she brought her daughter on the plane and that she never bought a 2nd ticket.

in the end, though, she finds that her daughter was kidnapped and hidden away and that the airplane was to blow up or something...

I don't really remember x(

please and thank you to anyone who knows the name!