A good look at the strategic issues of the air war is Richard Overy's
The Air War: 1939-1945. Although the book is based on primary sources and well-documented with notes, I found it very well written and an easy read. Among other topics, it compares and contrasts the approaches that each major power took regarding production, planning, training, and application of scientific research. Highly recommended.
Overy's section on training actually reminded me of a comment that Neal Stephenson made in his novel "Cryptonomicon" to the effect that the Axis lost because they worshipped Ares while the Allies worshipped Athena.
