The Skydivers (1963)

A couple owns an airfield that makes its money on skydiving in the middle of New Mexico. They are having marital problems: Tony is cheating on Beth, but she is trying to remain true to him. Tony's "other woman" is jealous of Beth, so she seduces Frankie--whom Beth and Tony have just fired--to conspire with her to kill Tony. Meanwhile, Tony's old Army buddy Joe comes to town to take the recently-vacated job; he pays lots of positive attention to Beth and they become friends and even flirt a bit... and the whole time, they all enjoy coffee.