The Aerial Missile Launcher is an airborne turret with four missile slots. It hovers with the help of two motors on top. A red-lighted sensor determines the target and locks on to it, then releasing a missile.
Despite being airborne, the turret does not move, staying in place. This makes them different from Drones which can move from one place to another.
Their missile slots make them quite dangerous when facing against them, although as turrets, they have their blind spots.
Source[]
- James Cameron's Avatar: The Game (Wii/PSP) Ingame observation