While the overall movie seems to be on the B-movie side, there are some aspects that make it really interesting. Especially on the script side. The expected unexpected is only the start.
Yes, the plane is hijacked; but that is only the premise, not a spoiler... and I'm not giving any spoilers here. Do some suspension of disbelief, and take the ride.
I, for one, enjoyed it. :)
NB: The child actor is surprisingly good (though not perfect).