I've been reading
Jugoslovensko Ratno Vazduhoplovstvo 1942-1992 from military historian Bojan B. Dimitrijević: (Belgrade 2009) and I've noticed that Yugoslavia used more types of aircraft than the current OOB presents.
Thus, I would suggest you consider adding the following aircraft Yugoslavia (I only counted those of which a significant number were available). Most can already be found in other OOBs, so I've also listed where to find them:
Bell 47G
Date: 1960-1967
Can be found in: obat07 unit 524 (WinSPMBT)
Canadair CL-13 Sabre
Date: 1956-1971
Can be found in: obat30 units 341-342 (WinSPMBT)
Ikarus S-49
Date: 1950-1961
Can be found in: n/a
Info here:
http://en.wikipedia.org/wiki/Ikarus_S-49
Note: this was the first locally-built fighter-bomber.
Lisunov Li-2
Date: 1946-1970
Can be found in: obat11 unit 539 (WinSPMBT)
Messerscmitt BF-109G
Date: 1946-1952
Can be found in: spob16 unit 122 (WinSPWW2)
Note: obat 43 (WinSPMBT) unit 360 could perhaps be used for the icon and photo.
Mikoyan Mig-21PFM
Date: 1962-1994
Can be found in: obat11 unit 942 (WinSPMBT)
Mil Mi-2 Hoplite
Date: 1969-1989
Can be found in: obat11 unit 311 (WinSPMBT)
North American F-86 Sabre
Date: 1961-1974
Can be found in: obat12 units 126, 941 (WinSPMBT)
Petlyakov Pe-2FT
Date: 1946-1964
Can be found in: obat37 unit 157 (WinSPMBT)
Republic P-47D Thunderbolt
Date: 1951-1961
Can be found in: obat48 units 131, 132, 910 (WinSPMBT)
Soko G-2 Galeb
Date: 1965-1999
Can be found in: obat 60 unit 152 (WinSPMBT)
Note: for some reason this Yugoslav-built plane exists in the Croatian OOB, but not the Yugoslav one
Spitfire MK V
Date: 1946-1952
Can be found in: obat01 unit 136 (WinSPMBT)
Yakovlev Yak-3 Ubiytsa
Date: 1946-1957
Can be found in: obat19 unit 149 (WinSPMBT)
Yakovlev Yak-9
Date: 1946-1957
Can be found in: obat11 units 124, 939 (WinSPMBT)
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In addition, UNIT 170 in this OOB (OOB 41, Soko Kraguj J-20) is no longer in service. It was officially withdrawn in 1989, though it was still used until 1994, so you may want to correct it's availability dare