Air Vehicles

All air vehicles are strong against all defenses and weak against all ground units. 

Scout Helicopter
Scout Helicopters are your Tier 1 air vehicle.  They have medium speed and a moderate load capacity, but very low attack, defense, and health.

Advanced Interceptors
Advanced Interceptors are your Tier 2 air vehicle.  They have high speed and a moderate load capacity but low attack, defense, and health.

Jet Fighters
Jet Fighters are your Tier 3 air vehicle.  They have very high speed, health, and defense, decent load capacity and power, and moderate attack.

Advanced Interceptors
Advanced Interceptors are your Tier 4 air vehicle - the best air vehicle you can produce.  They have incredibly high speed, health, defense, and power, as well as moderate attack and load capacity.