The airfields may have not been completely knocked out but there was alot of damage to them and the factories and you don't think that had the german invasion had worked that the captured british industry could produce enough aircraft to replenish the lost aircraft needed for Barbarossa?

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They shall grow not old as we that are left grow old Age shall not weary them, nor the years condemn
At the going down of the sun and in the morning
We shall remember them. Lest We Forget