Switzerland has a publicly managed road network without road tolls that is financed by highway permits as well as vehicle and gasoline taxes. The Swiss autobahn/autoroute system requires the purchase of a vignette (toll sticker)—which costs 40 Swiss francs—for one calendar year in order to use its roadways, for both passenger cars and trucks. The Swiss autobahn/autoroute network has a total length of  (as of 2000) and has, by an area of , also one of the highest motorway densities in the world. Zurich Airport is Switzerland's largest international flight gateway, which handled 22.8 million passengers in 2012. The other international airports are Geneva Airport (13.9 million passengers in 2012), EuroAirport Basel Mulhouse Freiburg which is located in France, Bern Airport, Lugano Airport, St. Gallen-Altenrhein Airport and Sion Airport. Swiss International Air Lines is the flag carrier of Switzerland. Its main hub is Zürich, but it is legally domiciled in Basel.