Ok, Shield of Humanity has new Vehicle Trait called Anti-Air (Rudimentary/Advanced).
I understand how it works but can't find anywhere what is standard penalty for ground vehicles firing at aircraft.
Only penalty I found from Only War CRB, was from p. 38 Flying: Low Altitude (-10 to BS in addition to any normal penalties from range.)
Other was from Final Testament, p.144 Vehicle Trait: Flya. But it has its own explanation of modifiers you get.
-50 to BS when shooting with weapon not meant for AA fire
or
-20 to BS when using designated AA weapon.
Is this again something that FFG is printing rules against Traits before they have that specific Trait in the game? Or is this just case of specific rule blindness.