Quote -
On a flight from Los Angeles to Paris a mad scientist (Midkiff), on the run by the CIA, is transporting a coffin containing the body of a colleague infected with a genetically modified virus. While the 747 crosses a violent thunderstorm, the instability of the aircraft allows the corpse to get out of its container. The flesh-eating zombie quickly starts to spread the virus, infecting many of the passengers which now will have to fight for their lives stranded in the air with no way out...
http://www.imdb.com/title/tt0780583/
I'd rate it at about 3 out of 5.
But some part's of it were VERY unrealistic - For example, they are shooting guns all over the place yet the place still seems to be flying. And at one point, they set off a big bomb, which would have taken down the plane.. But strangley enough, it kept on going. !