You don't want AI to have more than one airbase. Believe me, you don't. The same with any production facility (barracks, warfactory, conyard, syard). It makes the AI go haywire. Try giving some other buildings Factory=BuildingType (the Conyard tag, that enables it to build buildings) and you'll see what the AI does.
If you still want AI to have the second airbase, make a copy of the airbase, and set it to TechLevel=-1. The AI will build it, the human players wont' get it on their sidebar.
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