Planes gain a certain number of internal proficiency points with some random variance every time they participate in Aerial Combat or Detection. The amount gained depends on the exp-rate group of the plane.<ref>https://docs.google.com/spreadsheets/d/1tGEtDid5q7ngve1m07TK5JO2MF2BCTd6OiyObPRpkqU/edit#gid=347908809</ref>
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Planes gain a certain number of internal proficiency points with some random variance every time they participate in Aerial Combat or Detection. The amount gained depends on the exp-rate group of the plane.