Isby, David. "Luftwaffe Triumphant: The Defeat of the Bomber Offensive, 1944-1945"
Divergence: 1942 CE
What if: Nazi Germany was more flexible in reponding to the RAF and USAAF bombing campaign of German cities, including easing aside Göring in favor of Galland and shifting toward production of fewer but better fighter aircraft, while the RAF and USAAF were less flexible in adapting to German defenses.
Summary: The bombing campaign against of Germany of early 1944 turns into a disaster, and Germany is somewhat better able to respond to the Normandy invasion.
Published: In Third Reich Victorious: Alternate Decisions of World War II (ed. Peter G. Tsouras), q.v.