Polish (their state and their military) have had a few things that Yugoslavs lacked. There was no universal dislike for the ruling Serb dynasty by more than half of population. They were not surrounded from day one of invasion. Germans and Italians quickly established puppet states all along of Yugoslavia within a days and weeks. Yugoslav AF itself was not as well dispersed as the Polish AF.
Bf 109E was a benchmark in 1939-40, but not in 1941, let alone the Hurricane I outfitted with fixed pitch prop and no 100 oct fuel.
Bf 109E was a benchmark in 1939-40, but not in 1941, let alone the Hurricane I outfitted with fixed pitch prop and no 100 oct fuel.