Short answers, pulled from the story.
The War Department issued a revision to Army Regulation 95-5 on the 20th of June 1941 that created the United States Army Air Forces. This document dissolved the dual status of the Air Corps and the General Headquarters Air Force.
Henry H. Arnold assumed the title of Chief of the Army Air Forces for the first time in history on the 20th of June 1941. His title changed to Commanding General, Army Air Forces effective the 9th of March 1942 following Executive Order 9082.
In all, the United States produced nearly 300,000 aircraft in the years 1941-1945 inclusive. The AAF reached its wartime inventory peak of nearly 80,000 aircraft in July 1944 before trimming back to 73,000 at the end of the year.
African-Americans comprised approximately six per cent of this force with 145,242 personnel in June 1944. In all facets of the service, more than 420,000 civilian personnel were employed by the AAF while over 1.4 million men received technical training as aircraft mechanics and electronics specialists.
The most numerous individual types were the B-24 Liberator with 5,906 units, the P-47 Thunderbolt with 5,483 units, the B-17 Flying Fortress with 4,525 units, and the C-47 Skytrain with 4,454 units. First line combat aircraft in July 1944 totaled 492 very heavy bombers, 10,431 heavy bombers, 4,458 medium bombers, 1,733 light bombers, 14,828 fighters, and 1,192 reconnaissance aircraft.