Beyond Tomorrow (1940)

Melton (Harry Carey), Chadwick (C. Aubrey Smith) and O'Brien (Charles Winninger), rich but lonely heads of an engineering firm, invite three strangers to dinner on Christmas Eve. Only two show up, James (Richard Carlson) and Jean (Jean Parker), they fall in love and become friends with their three benefactors, until the latter are killed in a plane crash and come back to their old home as ghosts. In the coming months, true love encounters some rough spots. Can ghostly O'Brien help the young folks?