Air Units' stats and properties can be modified as a whole, by using the GameEnums.UnitType_Air variable.For instance:

CO_TEST.getOffensiveBonus = function (co, attacker, atkPosX, atkPosY,
    defender, defPosX, defPosY, isDefender, action,luckmode, map) {

    if (co.getIsCO0() === true) {
            switch (co.getPowerMode()) {

            case GameEnums.PowerMode_Power:
                if (attacker.getUnitType() === GameEnums.UnitType_Air) {
                    return 30;
                }
            break; 
       //rest of the code goes here
       }

    }

}


Increases the Offense of Air Units by 30% during the CO Power.


Modifying stats or properties of specific Units

Each Unit can be modified through a comparison of the UnitID. The Unit ID can be obtained through unit.getUnitID() And it's of a String type.

Possible values are, along with their weapon names:

Air units and their weapon strings
Air Units Weapon Strings
K_HELI[1] N/A
T_HELI[2] N/A
DUSTER[3] N/A
BOMBER N/A
STEALTHBOMBER N/A
TRANSPORTPLANE N/A
FIGHTER N/A
WATERPLANE[4] N/A
ZCOUNIT_KIROV[5] N/A
BLACK_BOMB N/A


Of these, the ones with the ZCOUNIT_ prefix are Units specific to COs that cannot be deployed by the rest.

Notes

  1. Same Unit as Battlecopters
  2. Same Unit as Transport Copters
  3. Same Unit as that from Days of Ruin/Dark Conflict
  4. Same Unit as that from Days of Ruin/Dark Conflict
  5. CO Unit of Tasha, Eagle, Waylon