The T2 mobile flak artillery for the factions are the respective UEF Sky boxer, Cybran Banger, Aeon Ascendant, and the Seraphim Iashovah. Flak artillery are anti-air weapons with high DPS and a large area of effect, dealing significant damage to clusters of air units, especially the slow gunships.
The mobile versions of the flak artillery have less HP than T2 anti-air flak artillery but cost much less, and have almost exactly equal DPS.
It is worth noting that the Aeon and Seraphim variations hover over water and are faster than the Cybran and UEF variations, with the UEF version being the slowest. The UEF Sky Boxer possesses the highest rate of fire and rear-facing cannons, along with the slowest speed, allowing you quite interesting strategies. The Cybran Banger has the lowest rate of fire and highest damage per shot, giving it alot of overkill. The Aeon Ascendant and Seraphim Iashavoh are the same in every way but appearance but both are the fastest and hover.
The primary role of T2 mobile flak artillery is to protect large armies from large-scale air attacks, being the most powerful mobile ground-to-air attack mechanism, and their high DPS and medium health make them good at this. However, while they are very effective against gunships, and T1 attack bombers, they become less useful later in the game, as they cannot hit faster targets. Therefore, they are can often become a poor substitute for maintaining Air Superiority.
If necessary, particularly if an anticipated enemy air force has failed to materialise, these units can be used as cannon fodder during a retreat or an assault as they have the highest health/mass cost ratio of any T2 or T1 unit, of 6.25.
Another use for these units is defensively. Although they have far less health than a T2 anti-air flak artillery, they cost 3.5× less mass and 7× less energy each, while attacking with the same DPS. This means that a stationary shield protecting mobile AA can be more effective than simply using stationary emplacements, if on a larger scale, as the below table demonstrates:
Aeon T2 shield generator + 5 "Ascendants"
3× Stationary Aeon T2 flak artillery "Marr"
11000 (Shield) + 5×1000
'*Mass and energy values for the shield take the cost of the power generator needed to support it into account
This method also allows other key structures to be protected by the shield, and it is more versatile because the AA can move out whenever needed. The regeneration of the shield is useful as well. Adding this to the ability to place your ACU under the shield suggests that T2 mobile AA flak artillery can be a potent tool in fighting against gunship rushes. The tactic can be done on smaller scales by the Cybrans with equal success, as their shields cost less than other factions' but are weaker.