In 1933, Cluj Airport was declared an International Airport by the Romanian Government. The first international flight, a CSA Czech Airlines Prague-Cluj-Bucharest flight, took place on 11 September 1933. The aircraft used on this route were eight-seat Avia-Fokker aircraft. In the following years, several new routes were opened, such as the Aeroflot Moscow-Cluj-Prague flight, opened on 15 November 1935, which was operated with 14-seat McDonnell Douglas DC-2 twin-engine aircraft, registered as USSR-M25 and USSR-M26. Internal flights were also operated in this period, such as Cluj-Satu-Mare and Cernăuţi-Cluj-Arad using Lockheed Model 10 Electra ten-passenger aircraft and de Havilland Dragon Rapide aircraft. In the late 1930s, the airport recorded steady growth and the employees' number rose from 6 in 1934 to 16 in 1939. The passenger terminal was also built in this period, being inaugurated in 1939.