[Indy and his father have stolen a plane from the airship, and are now being chased by German fighters]
Indiana Jones: Dad, you're going to have to use the machine gun. Get it ready!
[Henry turns around and gets the gun ready]
Indiana Jones: [spotting an approaching fighter] 11 o'clock! Dad, 11 o'clock!
Professor Henry Jones: [looking at his watch] What happens at 11 o'clock?