The Croatian airline Trade Air is about to add an Airbus A319 to its fleet. The machine is scheduled to arrive in Zagreb in late May / early June. It is a leasing aircraft from AerCap that was previously in the service of FlyBosnia.
According to CH-Aviation.com, said Airbus A319 previously had the registration E7-FBA and is to be entered in the Croatian register as 9A-BTJ. Trade Air's fleet currently consists of a Fokker 100 and three Airbus A320s.
There are some PSO-subsidized line routes within Croatia. You do not operate these yourself, you use wet lease services from the Czech Van Air Europe. Let-410s are used as aircraft.