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Calculate a new air-to-air strength at the start of each round. It is equal to the air-to-air rating of your front fighter with bonus for each other FTR equal to that FTR's air-to-air rating divided by the air-to-air rating of the front enemy FTR (or bomber if it has no FTRs) and a bonus for each other carrier plane equal to half that carrier plane's air-to-air rating divided by the air-to-air rating of the front enemy FTR (or bomber if it has no FTRs).
Example: you have 3 FTRs against 2 enemy FTRs. Your FTRs are, in order, 6, 5, and 4 air-to-air rating; the enemy FTRs in order are 9 and 8. Your air-to-air strength for the round is 7 (front FTR is 6 + (5/9) + (4/9) = 7). The enemy's air-to-air strength is 10.3 (front FTR is 9 + (8/6) = 10.3).
Background/Purpose: Second rank FTRs no longer uniformly add +1, now they are gradated based on the quality of the enemy airplanes they are facing.