Chuck Connors, Buddy Ebsen, William Shatner (!), Russell Johnson (Professor on Gilligan's Island), et al. Boy, am I sorry I've never seen this one! Plot summary: Crew and passengers come into jeopardy when an invisible demon escapes from an ancient abbey stored in the plane's cargo hold, and threatens to destroy the plane in an effort to destroy one of the passengers.

Information from the Internet Movie Database.