Together with the older P.7, both remained the only Polish fighters in service, however, with about 185 P.11s available, distributed within six air regiments and the aviation school in Deblin. Being aware that the P.11 was now outdated, the Polish Air Force had pinned their hopes on the in-development PZL.50 Jastrząb, which suffered from several delays. When it became apparent that the PZL.50 would not be in widespread service in time for a major conflict that was clearly looming, consideration was given to producing an updated version of the P.11; this was to have been powered by the 840 hp (626 kW) Mercury VIII and have been furnished with an enclosed cockpit, known as the P.11g Kobuz ("hobby"). Only the prototype of the P.11g with a maximum speed increase to a still-slow 390 km/h (~240 mph) was flown before the war, in August 1939.