Air kills calculator is broken

[Plaid]

So yes, it is. In one of games there was intensive air combat for several turns (for example, french fighter was reduced from 9 steps to 1), while calculator (one showing, how soon Ace will appear) shows only 3/30.
Probably it counts only damage, which air units inflict to ground ones, or don't count damage from interception (and it is odd, since interception is the most common air vs air battle, if you want to attack enemy fighter on the ground, you have to use ground attack and will score bad results often).

As a result of mentioned above aces never appear.