The reason the snakes are on the plane is unveiled in the first scene of the movie. Maybe the CGI is better on DVD, but on Blu-ray, it looks awful. Very graphic snake attacks. The passengers running around the plane was over done, drink carts appear as heavy as gun safes. The aviation portion is a mix of really really fake, to slightly accurate. Overall, I'm pretty sure I know why I waited 12 years to see this. Likely I'll never watch it again.