There are two air unit types in the game: bombers and fighters. Bombers can only attack targets on the ground or at sea; fighters can attack ground/sea targets and other air units.
Air Unit Refueling
Unlike other units, air units can move on all spaces - land, sea, mountain, and icecap. However, unlike other units, air units must periodically stop in a city to "refuel" - fighters every two turns, and bombers every four. If an air unit doesn't refuel in time, it's destroyed.
Air Unit vs. Ground Units
A ground unit cannot initiate combat against an air unit. If the air unit attacks a ground unit the combat occurs normally, and either side can be damaged or destroyed.
Air Units vs. Ot her Air Units
Only a fighter air unit can initiate an attack against an enemy fighter or bomber.
Otherwise, air-to-air combat is the same as any other type of combat.
Air Unit Types
There are two air unit types in the game:
Bomber
Tech Requirement: Advanced Flight
Cost: 60
Attack Strength: 18
Defense Strength: 3
Movement: 6
Refueling Range: 4 turns
Bombers can only attack non-air units. They must end their turn in a city (refuel) within 4 turns or they crash and burn.
Fighter
Tech Requirement: Flight
Cost: 30
Attack Strength: 6
Defense Strength: 4
Movement: 8
Refueling Range: 2 turns
Fighters can attack air, land and naval units. Fighters must end their turn in a city (refuel) within 2 turns or they crash and burn.
 
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