Finally saw it last night!
A good movie, to be sure, but it would be easy to start tearing it to shreds via its plot holes! I enjoyed it though, so won't do so. But seriously - only a single purser/stewardess assigned to the First Class cabin on a SYD-LAX flight? Pfffft!
It's one of those movies that deserves a second viewing to fill in the gaps (or spot the errors!).
A fantastic ensemble cast, too - I don't usually like diCaprio but he was very watchable in this. I tend to feel similarly lukewarm about Cillian Murphy, too, but I guess it helped he had a relatively minor part (I had no idea he was in the movie before seeing it, I'd deliberately avoided all reviews and spoilers).