Anti-air

Anti-Aircraft guns is a building used to shoot down hostile air units.

There are two versions, one for WWI-Modern age, and one for Digial+, the main difference are in stats and the method of shooting air units...

WWI-Mod AA

This type of AA uses a mounted gun to shoot down aircraft.

Digital Age+

This type of AA shoots missiles at aircraft.

Differences

The main differences are that the Digi AA has higher damage, however some may say that the WWI AA is superior, because the damage is applied to the target instantly, rather then when the missile hits.