The Luckiest Man in the World (1989)

New York City garment manufacturer Sam Posner is a liar, a bully and a cheat who makes life unpleasant for his wife, mistress and everyone else around him. When he's late for a flight that ends up crashing on the runway, the near-miss causes him to change his entire personality and resolve to be nicer to those around him, including the gay son he had disowned. But his employees and family have trouble adjusting to the new Sam.