Now We're in the Air (1927)

Wally and Ray are cousins intent upon getting the fortune of their Scotch gran-dad, an aviation nut. They become mixed-up with the U. S. flying corps and are wafted over the enemy lines in a runaway balloon. Through misunderstanding they are honored as heroes of the enemy forces, and sent back to the U. S. lines to spy. Here they are captured and almost shot, but everything ends happily.