Transport in Zagreb, the capital of Croatia, relies on a combination of city-managed mass transit and individual transportation. Mass transit is composed of 19 inner-city tram lines and 120 bus routes, both managed entirely by Zagrebački električni tramvaj. Croatian Railways manages the parallel Zagreb Commuter Rail system. The city is served by the Franjo Tuđman Airport, which carries more than 3,300,000 passengers per year.