Serbia and Montenegro Air Traffic Services (SMATSA) is responsible for air navigation service provision within the airspace of 145,556 square kilometers, encompassing the airspace of the Republic of Serbia, the State of Montenegro, a part of the airspace above the Adriatic Sea, as well as 55% of the upper airspace of Bosnia and Herzegovina. The primary business activity of SMATSA is Air Navigation Service provision, with additional services including air traffic control officer training, flight training, flight calibration of ground based radio navigation aids, consultancy services and aircraft maintenance services. Find out more at http://www.smatsa.rs.