Sarajevo Airport opened on 2 June 1969 for domestic traffic. In 1970, Frankfurt became the first international destination served. Most of the time the airport was a 'feeder' airport where passengers embarked for flights to Zagreb and Belgrade on their way to international destinations. Over time, the traffic volume steadily grew from 70,000 to 600,000 passengers a year. Later, during the Bosnian War, the airport was used for UN flights and humanitarian relief. Since the Dayton Agreement in 1995, the airport retook its role as the main air gate to Bosnia and Herzegovina.