From their announcement:
Combat Wings 12 O’clock are a complete new set of rules, derived from our WWI aerial rules.
With these rules you can play aerial combats from the Spanish Civil war, WWII the the Korean War. Our first plane data cards are to play the aerial combats of the Spanish Civil War, a total of 90 planes of fighters, ground attack planes, bombers, and reconnaissance.
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The most complete aerial Game of the Spanish Civil War ever published.