As far as I know all the AVIOGENX fleet is operating other-where. The 737's and 727's were all transfered to Nigeria nad some other "parent" countries.
Recently there was a very bad landing of the b737 with some new practicing pilot. Genex the company that owe Aviogenex is not going so good and there are not turistical interest for Serbia, and that is bad for them, they were a charter company.
Hope it helps.
Savo, Salerno, ITALIA