It depends which front you are talking about.
If it was against the Nazis, I would say the Battle of Britain. Majority of the Battle of Britain was fought in air. The intent of the battle was to get the British to surrender by conduction Blitzkrieg attacks. Hitler's decision to invade Britain was incredibly costly, with both sides losing thousands bombers and fighters. I believe this really hampered the German war machine, losing a lot of its air superiority. If Britain had been invaded, the war would have taken a drastic turn.
In the pacific against the Japanese, I would say the Battle of the Midway was the turning point. If the Americans had lost majority of their carriers, the war would have been prolonged indefinitely.
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