I would like to add a few notes to this most interesting discussion if I may.
Technically speaking, all those military airfields attacked by the partisans in Yugoslavia were on the territory of the Independent State of Croatia (i.e., Nezavisna Država Hrvatska), today's Republic of Croatia and Republic Bosnia and Hercegovina (Banja Luka - Zalužani and Sarajevo - Rajlovac). I hope that I am not nitpicking here.
This one is I feel more to the point - Agram-(Velika) Gorica and Agram-Pleso in my opinion refer to the same airfield, today's Zagreb International Airport
http://en.wikipedia.org/wiki/Zagreb_Airport
I would rather refer to the 1st Partisan Border Brigade as the 1. Krajiška brigada (Kraina Brigade) as given in post No.2. "Krajina" was a military zone established by the Habsburg Empire along the border with the Turkish Empire on the Balkan peninsula starting from I believe 17th century. The term is not necessarily synonym with the word "border".
Regards,
Sinisa