The biggest bonus from plane proficiency is giving a fighter power bonus to help during the [[Aerial_Combat#Air_Control|air control phase]]. The innate bonus is added onto the fighter power bonus of the relevant plane to get the full fighter power bonus.
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The biggest bonus from plane proficiency is giving a fighter power bonus to help during the [[Aerial_Combat#Stage 1 - Battle for Air Superiority|Stage 1]]. The innate bonus is added onto the fighter power bonus of the relevant plane to get the full fighter power bonus.