Three's a Crowd (1969)

In the spirit of the classic "My Favorite Wife" but with a mid-20th-century spin, airline pilot Jim Carver marries Jessica when he thinks that his first wife Ann has died. Movie-of-the-Week hilarity ensues when Ann shows up alive and Jim tries to balance both marriages and households, one with Ann in Los Angeles and the other with Jessica in San Francisco. How fortunate that his airline job takes him back and forth between the two cities on a routine basis.