 At that time, the new unit was equipped with 106 combat aircraft (Yak-1, Il-2 and Po-2).In September 1944, in the area of Kharkiv and Kazan, Soviet authorities started to form the Polish 1st Mixed Air Force Corps (at first with Soviet personnel, gradually replaced with Polish graduates of Soviet air force schools).The new Corps were equipped with 303 aircraft (Pe-2, Yak-9, Yak-3 and Il-2).