 The "Luftwaffe" retained air superiority into November, and Soviet daytime aerial resistance was nonexistent.However, the combination of constant air support operations on the German side and the Soviet surrender of the daytime skies began to affect the strategic balance in the air.From 28 June to 20 September, "Luftflotte" 4 original strength of 1,600 aircraft, of which 1,155 were operational, fell to 950, of which only 550 were operational.