Tehran Mehrabad International Airport, is a joint airport and one of the two international airports serving Tehran, the largest city in Iran. Until 2007 and before construction of the new airport for the city, Mehrabad was Tehran's primary airport in both international and domestic traffic, but after 2007 International flights transferred to Imam Khomeini International Airport. All International flights in Tehran are currently served by Imam Khomeini International Airport and all domestic flights are served by this airport. Although only domestic flights are served by this airport, in 2016 Mehrabad Airport handled 16,678,351 passengers and was the busiest airport in Iran in terms of passengers. The airport is also used by the Government of Iran and is one of the bases of the Iranian Air Force.