AI planes do go down so quickly, if you do them enough damage then they seem to stall but can recover but they generally crash. Also I have noticed that firing well wide in Training can still produce damage on the AI. Unfortunately in multiplayer my bullets don't have homing properties. Also in multiplayer a player is constantly moving and so taking less damage but even if they fly in a straight line and you pepper them they still do seem to take such a long time to die. This is probably to let you complete the campaign without having to spend hours shooting one plane and yet not get frustrated when one bullet kills you in online.
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