Hypothetically if Hitler hadn't reinforced North Africa with a full army and with massive amounts of aircraft, mostly transports, could these forces have saved the 6th army at Stalingrad?
At the time the Germans were trying to supply the Stalingrad pockets hundreds of transport aircraft were being used to reinforce Tunisia and over 100,000 German troops were brought in, creating Army Group Africa. Eventually nearly 130,000 Germans and over 100,000 Italians would be captured. The Axis air forces flew several thousand sortees and according to wikipedia some 600+ planes were captured and some 1000+ were destroyed.
If these forces were used on the Eastern Front (not the Italian ones because they were needed to pull out of Africa), could it have made a decisive different at Stalingrad? We are talking about hundreds, if not around 1000, of fighters, bombers, transports, reconnaissance aircraft, etc. that would have been available if the Africa front were abandoned for pulling back to Sicily and holding there. That's not to mention the full army of German soldiers that could have been fighting on the Eastern front to try and break the ring around the 6th army.