Captains of the Clouds (1942)

Brian McLean is a ruthless bush-pilot in Canada. He offers some other pilots an opportunity of earning a lot of money, but he marries the girl-friend of one of them. After listening to Churchill's famous "Blood, Sweat and tears" radio address he and some other pilots decide to join the RCAF - and his superior is always the pilot who's girlfriend he has married. Due to this and the fact, that McLean doesn't like to obey he gets troubles.