Fighter II

Advanced Fighters

This unit may move without being transported. Fighters in excess of your ships' capacity count against your fleet pool.

Technology – Unit Upgrade – Ship – Fighter

Unit Upgrade

This unit may move without being transported. Fighters in excess of your ships' capacity count against your fleet pool.

1 (×2)cost

8combat

2move

Prerequisites:

Source: Base game

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tirules.com

Fighters and ground forces do not count towards capacity during combat. As such, any number of Fighter II may be in a system during combat, regardless of capacity and fleet pool. This will usually only be caused by effects that place units in a system during combat. When combat ends however, units will need to be removed to meet capacity and fleet pool requirements.
A ship cannot move through a system that contains Fighter II that are controlled by another player during the Movement step of a tactical action.
Ships may be moved into, produced in or placed in a system even if doing so would exceed the fleet pool limit. However, some of those ships must immediately be removed to satisfy the limit. If some of those ships are fighters II, they may instead count towards that player’s capacity in that system. If capacity is exceeded, fighters or ground forces must be removed to meet the limit.

tirules.com

If the Letnev player owns the Fighter II unit upgrade technology, another ship may have its move value increased to match that of a Fighter II in that system.

Sources