 And then at 300, we're just three hours into this, using the almost complete air superiority that had been hard won over the previous months, especially since the P-51 Mustang had started to clear the Messerschmitts from the skies of Western Europe. From January 1944, Allied bombers began their massive raids against German defenses across Normandy. While the Luftwaffe flew 319 sorties over Normandy that day, the Allies flew 13,700 sorties.