Zürich Airport (, ), also known as Kloten Airport, is the largest international airport of Switzerland and the principal hub of Swiss International Air Lines. It serves Zürich, Switzerland's largest city, and, with its surface transport links, much of the rest of the country. The airport is located north of central Zürich, in the municipalities of Kloten, Rümlang, Oberglatt, Winkel and Opfikon, all of which are within the canton of Zürich.