Name of TV Movie, Released between 1972-01-01 and 1983-12-31, Fantasy, Mystery, Sci-Fi, US-G, United States, English, Plot Matching "plane passengers from Los Angeles arrive to an island but all are dead (although they do not know it), musician dead on plane recognized by another passenger (reminded me of Jim Croce)"

I remember there was this couple among the passengers that were having issues in their marriage among the passengers.

Kind of Fantasy island movie