Short answers, pulled from the story.
The Combined Bomber Offensive began its planning phase in December 1942 when the US Committee of Operations Analysts started work. This group submitted a report to General Hap Arnold on the 8th of March 1943 that identified six vulnerable target systems including German submarine yards and oil production.
Air Minister Arthur Harris issued the Casablanca directive on February 4 with specific objectives for the campaign. The plan called for 944 bombers in the first phase increasing to 2,702 by the final phase and focused on primary targets like aircraft factories and ball bearing plants alongside intermediate objectives focused on German fighter strength.
By the Normandy Landings only 80 operational Luftwaffe aircraft remained on the North French Coast managing about 250 combat sorties against 13,743 Allied sorties that day. The last two Jagdgeschwader 26 Fw 190As piloted by Josef Priller and Heinz Wodarczyk conducted sparse day sorties over Normandy beaches before June 7 when the Luftwaffe began redeploying approximately 600 aircraft to France.
Strategic Bombing Directive No. 4 issued the 12th of April 1945 officially ended strategic bombing campaign in Europe. Control of all air operations transferred to Eisenhower at noon on April 14 when he decided transportation plans offered reasonable chances for air forces contributing to land battles.
Single-engine fighter production reached its wartime peak in September 1944 at 3,031 aircraft per month totaling 25,860 ME-109s and FW-190s for the entire year. Total German single-engine fighter production for 1944 reached 25,860 ME-109s and FW-190s according to William R. Emerson despite heavy losses inflicted during early operations.