The Yak-9 was the first model in the most mass-produced family of the WWII Soviet fighters - with its many modifications the total amount of units produced reached 16,769. The work on the new long-range recon and fighter plane began in the Yakovlev design bureau during Spring 1942 and it resulted in the creation of Yak-7DI, which was adopted by the VVS as early as August 6th of that same year under the designation Yak-9. The new model had a boosted M-105PF engine, a lighter wing of composite structure, and the lower spine with a bubble canopy that significantly improved the rearward visibility. In comparison to the earlier Yak-7b, the armament was reduced to one nose-mounted 12.7mm UBS MG and one 20mm SHVAK engine-mounted cannon firing through the propeller hub.

The mass production of the new fighter and its arrival to the frontline units begun only in 1943. In combat, the Yak-9 proved itself as very maneuverable and easy to control fighter, earning the love and respect of many Soviet pilots along with volunteer French from the Normandie Niemen fighter regiment.