Luxembourg City is served by the only international airport in the country: Luxembourg Airport (codes: IATA: LUX, ICAO: ELLX). Accessibility to the airport, situated in the commune of Sandweiler,  from the city centre, is provided via the municipal bus network, with a tram connection due to be completed by 2021. The airport is the principal hub for Luxembourg's flag carrier, Luxair, and one of the world's largest cargo airlines, Cargolux.