a. WINGS – The new unit type, the air unit.
b. SURFACE UNITS – Armies and fleets.
c. UNITS – Any type of unit – wings, armies and fleets
d. AIRBASE – A supply center owned by the same country as the wing trying to occupy it. During spring moves where an enemy unit occupies a SC you own, it is not considered an airbase. During spring moves where a friendly unit occupies an enemy SC, it is not considered an airbase.
2. A wing must end each turn in an airbase, hence begins each turn in an airbase.
a. Optional rule: Aircraft Carriers – Fleets at sea belonging to the same country as the wing can act as airbases.
3. Each wing is equal in strength to surface units.
4. Each supply center can maintain one surface unit or two wings.
5. There can be no more than one surface unit in any space.
6. There can be no more than one wing in any space.
7. One wing and one surface unit may occupy the same space, as long as they belong to the same country.
8. A wing can perform its orders over land and sea spaces.
9. A wing may support the actions of any surface unit belonging to any country.
10. A wing may not be supported by any other units, including other wings.
11. A wing has four possible actions (five if using the below optional AIRLIFT rule). They are MOVE, ATTACK, SUPPORT, HOLD. Note that there is a distinction between moving and attacking.
a. MOVE – A wing may attempt to move from its current airbase to another airbase one or two spaces away (remember it can not be supported into that space). If the wing is prevented from moving to that space by an equal or superior force, it holds in the space it came from. A wing can attempt to move to a space that is not an airbase at the beginning of the turn, but is anticipated to be an airbase at the end of the turn. If it is not an airbase at the end of the turn, or if a wing is ordered to move to any non-airbase, the move results in the wing holding in the space it came from.
b. ATTACK – A wing may attack any space one or two spaces away from the wing’s location. This is not an attempt to move. Tactically, this order serves the purpose of cutting the support of the unit being attacked.
c. SUPPORT – A wing may support any action of any surface unit into any space one or two spaces away from the wing’s location, including the space the wing occupies.
d. Optional rule: AIRLIFT – Wings can airlift an army. This amounts to a convoy using the normal convoy rules. An army hops over the wing (or series of wings) which stay in place. If any wing in the chain is dislodged, the airlift fails.
e. HOLD – A wing which holds uses its strength of one to defend the space it’s in, but it can not be supported in holding that space (this is true for any order which involves the wing remaining in place – ie. attack, support and airlift).
12. If a space which contains a surface unit and a wing is under attack, both units defend that space. But it is not required by the attacker to dislodge both units separately. The attacker’s forces only need a strength of three to win the battle and dislodge both the surface unit and the wing (assuming the surface unit in the space being attacked is not supported by any units from other spaces).
13. If a wing is dislodged, it may retreat to an airbase one or two spaces away. If none are within range, the wing must be disbanded.
14. In general, these air unit rules are meant to be consistent with the normal rules of Diplomacy. Try to apply the normal rules in situations not explicitly addressed in these rules.