After patch 1.4, air cover is broken if you use high TC. Sail in 256x, and you'll have it. :hmm:
And yes, air attacks spawn depending on a series of variables; unlike ships and convoys, there is no actual aircraft flying through the campaign map in real time.
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There are only forty people in the world and five of them are hamburgers.
-Don Van Vliet (aka Captain Beefheart)
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