In 1966 a new passenger terminal of 5.000 sqm was built, the apron was extended to 60.000 sqm and modern administrative airport headquarters were built along with control tower for the needs of Regional Air Traffic Control as well as a whole range of other buildings and service facilities.
In the following years the air transport over Zagreb Airport grew dynamically. New equipment was introduced to operate the existing volume of traffic. New airport maintenance buildings was erected - a new technical base and a technical warehouse, cargo loaders, mobile baggage loading equipment, etc.
In 1974 Zagreb Airport was reconstructed. The runway was extended to 3.250 m, the equipment and the radio-navigational units were modernized. Within the frame of the reconstruction a part of passenger terminal was enlarged, the aircraft taxiway was extended and new commercial facilities were opened.
During these years Zagreb was linked to 20 largest European cities. A large number of tourists from the European countries and from other continents were landing at Zagreb Airport and continuing their journey to the Adriatic Sea, the Plitvice Lakes, continental part of Croatia and to other attractive regions. The peek of the traffic today excised 2 million passenger.