The PZL P.23 was used by Bulgaria (46), Poland, and Romania (41).
There were twelve Polish squadrons equipped with 150 P-23s. Five Bomber Brigades and seven reconnaissance units.
There were 112 P-23bs lost in 16 days. 90 of them were lost in aerial combat.
Bulgaria received 33 P-43s by August 1939. These were used by four squadrons.