Day Raids on Berlin: PAN over US air base, Flying Fortresses. Shots of Flying Fortresses airborne, crewmen at their posts. Sequence during aerial battle, German fighters making passes at bombers, gunners firing, bomb aimer releasing bombs. Various shots of nearby bombers during battle, flak puffs. Sequence on bombers returning to base, one landing on belly. Shots of skyfull of US bombers.