Sky Giant (1938)

Given the job of training young pilots for important post-war cargo flights, hard-boiled Col. Stockton forces ex-officer Stag Cahill back into the military to be his aide at the academy. Complications arise when Stockton's son Kenneth arrives for training and Stockton, believing his son to be a slackard, looks for an excuse to drop him from the program. Rivalry develops between Stag and Ken as well, as they fall for the same girl.