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My AT needs a realistic way for the European theatre to drag on for at least 2-3 years longer, preferably more. The United Kingdom cannot be knocked out of the war, and the Royal Air Force must remain intact, though it can be weakened if necessary. Do what you must with America, the Soviet Union, France, Japan, North Africa, the Pacific, Italy, and so on. The Luftwaffe must remain largely intact. The date of the divergence from history is unimportant, as are most of the nations involved in the war aside from the UK and Germany. What is important is an air campaign between the Royal Air Force and the Luftwaffe in 1948 or later in which either side has a fair chance to win.
I'd also prefer to find a way to forstall the invention of jet aircraft, if at all possible, but if this can't realistically be done, I can live with having my AT's characters fly Vampires instead of Spitefuls.