just watched it (i know, slap on the wrist

)
it was.... ok. I mean, I enjoyed it, but not as much as I hoped I would, considering how long I've been waiting.
The problem I think (without giving too much away) was threefold. The film's selling point is it's claustrophobic environment wasn't actually what it was supposed to be. Like Panic Room (in a room, and a bit in the rest of the house) or Phone Booth (in the booth, and a bit in the rest of the street), the problem is that only about half of the film is actually in the plane!
Secondly, was the old 'deus ex machina' plot developments - whenever something needed advancing, a new prop or sufficient problem would arise to further the film. After a while it became a little tedious.
Finally, the actual point of the film (I know, it's a film, enjoy it for what it is) is so far-fetched and unnecessary. The bad-guys sure go to a lot of trouble for something that could've been simpler I'm sure.
Anyway, enjoy!