There's Snakes on a Plane and Snakes on a Train, but did you ever see a Zombies on a Plane? Well, you can if you want to, now, because Plane Dead is here to satiate your bloodlust.
http://www.planedeadthemovie.com/
Good production values, I must say.
By the way, the director, Scott Thomas, was the second unit director on American Ninja V. Quite a resume.