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From the beginning Eisenhower and the rest of the combined forces planners recognized that air power would be critical to success of Overlord. Experience had taught planners to avoid facing hostile air power over the battlefront. This meant that the Luftwaffe would have to be destroyed, but not at the price of sacrificing vitally needed air support missions for air superiority ones.
Fortunately, in early 1944 the Luftwaffe was on the skids. By the fall of 1943, Republic P-47 Thunderbolts equipped with long-range "drop" tanks were inflicting heavy losses on German fighters over Occupied Europe and in the German periphery. Then, in December 1943, the North American P-51B Mustang entered service. Featuring superlative handling qualities and aerodynamic design, and powered by a Packard-built Rolls-Royce Merlin engine, the P-51B (and its successors, the P-51C and P-51D) could escort bomber strikes to Berlin and back, thanks in part to a symmetrical wing section that was thick enough to house a large quantity of fuel and streamlined enough to minimize drag. These two fine aircraft were worthy supplements to the overall Allied strategic bombing effort.
Whatever the bombing campaign may or may not have accomplished in destroying enemy resources, it did contribute directly to the D-Day success. Large bomber formations were aerial magnets that drew up the Luftwaffe to be destroyed by the American fighter force. The omnipresent Thunderbolts and Mustangs (and less frequently P-38 Lightnings) gave the Luftwaffe no respite over Germany, complementing the shorter-legged Spitfires and Hawker Typhoons of the Royal Air Force.
Between January and June 1941 the five months before D-Day - the Luftwaffe was effectively destroyed: 2,262 German fighter pilots died during that time. In May alone, no less than 25 percent of Germany's total fighter pilot force (which averaged 2,283 at any one time during this period) perished. During Big Week, American air forces targeted the German aircraft industry for special treatment; while production continued, the fighter force took staggering losses. In March 1944, fully 56 percent of the available German fighters were lost, dipping to 43 percent in April (as the bomber effort switched to Germany's petroleum production), and rising again to just over 50 percent in May, on the eve of Normandy. No wonder, then, that the Luftwaffe could contribute less than a hundred sorties to the defense of Normandy. Months of concentrated air warfare had given the Allies not only air superiority, but air supremacy as well.
Basically, the Allied air campaign for the invasion of Europe consisted of three phases. First, Allied fighters would attempt to destroy the Luftwaffe. The second phase called for isolating the battlefield by interdicting road and rail networks. And once the invasion began, Allied air forces would concentrate on battlefield interdiction and close air support. The requirements to keep the landing sites secret-particularly the deception to encourage the Germans to devote their greatest attention in the region of the Pas de Calais-complicated the air campaign. Strike planners had to schedule vastly more operations across the sweep of likely landing sites rather than just at the true site of Overlord. For example, rocket-armed Royal Air Force Hawker Typhoon fighter-bombers of the Second Tactical Air Force (2 TAF) attacked two radar installations outside the planned assault area for every one they attacked within it.
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