Captains of the Clouds (1942)

Brian McLean is a ruthless bush pilot in Canada who seizes an opportunity for significant earnings, even at the expense of marrying the girlfriend of one of his fellow pilots. However, after listening to Churchill's famous "Blood, Sweat, and Tears" radio address, McLean and some of his pilot peers decide to enlist in the Royal Canadian Air Force (RCAF). Complicating matters, his superior officer is the pilot whose girlfriend he married, and McLean's aversion to obeying orders leads to a series of troubles.