Croatian start-up Trade Air and the nation's flag carrier are to codeshare on selected domestic routes.
Croatia Airlines will place its code on Trade Air's existing Osijek-Zagreb route and on services from Osijek to Dubrovnik, Rijeka and Split, planned for launch as part of the summer schedule.
All scheduled flights will be marketed with Croatia Airlines and distributed through its reservation system.
The agreement adds to Croatia Airlines' list of codeshare partners, which was joined last month by United Airlines. The US carrier is placing its code on Croatia Airlines' services to Zagreb from Amsterdam, Brussels, Frankfurt, London, Munich, Paris and Zürich, and to Dubrovnik and Split from Frankfurt and Munich.