September Affair

September Affair is a 1950 film, directed by William Dieterle, starring Joan Fontaine, Joseph Cotten and Jessica Tandy. It was produced by Hal B. Wallis.

At lunch, a recording of the Kurt WeillMaxwell Anderson song September Song, sung by Walter Huston, is playing. Manina is single, and David is unhappily married with a son in his late teens. They talk too long and miss their flight, and decide to stay on for a few days, getting to know each other. They quickly fall in love.Then they hear that the plane they were scheduled to catch has crashed into the ocean, and all on board are presumed dead. Due to a clerical mixup, they were believed to have been among those aboard. A list of the victims is published in a newspaper they pick up. Thinking their absences wont make any difference to the larger world, they decide to stay dead and begin a new life together in Florence. They make no contact with their families or friends, including Lawrences wife Catherine Jessica Tandy and son David Jr Robert Arthur. ........

Source: Wikipedia