I think a plane on autopilot should be treated like a plane which has no engine or is out of fuel: Only 8L, 2S and 8R moves. (If I remember the numbers correctly.) Think of it as the pilot losing conciousness, perhaps due to wounds or hypoxia (lack of oxygen) with plane lazily drifting around, easy pickings for any nearby enemy. They certainly should *not* be making incisive tactical moves ...