A second, daylight raid, by the USAAF was conducted at 16:40. It had been intended for 300 aircraft to attack Hamburg and Hanover but problems with assembling the force in the air meant that only 90 Boeing B-17 Flying Fortresses reached Hamburg. The bombers attacked the Blohm and Voss shipyard and an aero-engine factory, with German flak damaging 78 aircraft. However the shipyard was not badly damaged and the aero-engine manufacturer could not be seen for smoke (a generating station was attacked instead).