AI in servers is an absolute need, given the few online players. And you could never hope to find a formation of 12 human Heinkels nowadays (neither in Il2 1946 to be fair, apart from virtual wars), so it ain't BoB really without blessed AI's...
Back to the OP:
- Sometimes, when you engage an AI fighter it oscillates very quickly his wings as if he couldn't decide where to turn. Humans don't do that.
- If a fighter detects you in difficult visibility conditions (e.g. against ground), it's most probably an AI.
- A fast series of tonneaux declares itself as an AI fighter (although I've seen this only in offline as of today).
- Formations of bombers (from 2 bombers upwards) are 100% AI. Even if a human bomber tries to join it (but very few humans fly a bomber presently), normally he cannot keep pace.
With experience you will easily tell an AI from a human, most of times at least ...
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Cheers,
Insuber