I have interview and former Yugoslav pilot who was officer in the formation of Draza Mihailovic during the war and he is also managed to safe a number of West pilots during the war. First at all they have landed in area far away from German sight. Second- in Partisans (later become NOVJ) as well Draza formations served a number of former Yugoslav airman and they know how to prepare airfield for landings. Third- the same place was marked with fire.
Most difficult was to get the falling airman as well Germans also run to get it on place of it landing. Second was problem to keep airman safe and in most cases they was keep in private remote village houses.
I have somewhere complete list of rescued Ally airman during the war over Yugoslavia but hardly that I could managed to dig out from chaos of piles....
Cheers