Regarding DIXIE:
Ten years ago, I wrote regarding Turtledove's TL-191:
Quote:
...the kind of aircraft that the USA and CSA would build in a sane universe would be very large, very long legged aircraft, due to the much greater distances in North America.
From the western border of Germany to its eastern border, it's about 450-500~ miles. From Savannah to Dallas, it's 900~ miles; and many states are several hundred miles tall or wide. The sheer distance means that the USA and CSA are going to trend towards much heavier and longer ranged aircraft than the European norm.
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Basically, instead of Ju-87 Stukas, you'd see something similar to SB2A Buccaneers -- capable of flying a 500 lb bomb to 1,100 miles (combat radius of around 500 miles).
Either that, or you get twin engined ground attack aircraft.
I actually found something in the National Archives, where the AAF seriously asked for:
continued production of P-51A (Allison) engined mustangs as "A-36" strike aircraft
or
production of P-38s with no turbochargers as ground attack aircraft.