The Edge(1997)

They were fighting over a woman when the plane went down. Now, their only chance for survival is each other.

The plane carrying wealthy Charles Morse crashes down in the Alaskan wilderness. Together with the two other passengers, photographer Robert and assistant Stephen, Charles devises a plan to help them reach civilization. However, his biggest obstacle might not be the elements, or even the Kodiak bear stalking them -- it could be Robert, whom Charles suspects is having an affair with his wife and would not mind seeing him dead.