The country maintains  of roads, with three highways: the A1 from Tunis to Sfax (works ongoing for Sfax-Libya), A3 Tunis-Beja (works ongoing Beja – Boussalem, studies ongoing Boussalem – Algeria) and A4 Tunis – Bizerte. There are 29 airports in Tunisia, with Tunis Carthage International Airport and Djerba–Zarzis International Airport being the most important ones. A new airport, Enfidha – Hammamet International Airport opened in 2011. The airport is located north of Sousse at Enfidha and is to mainly serve the resorts of Hamammet and Port El Kantaoui, together with inland cities such as Kairouan. Five airlines are headquartered in Tunisia: Tunisair, Syphax airlines, Karthago Airlines, Nouvelair, and Tunisair Express. The railway network is operated by SNCFT and amounts to  in total. The Tunis area is served by a Light rail network named ''Metro Leger'' which is managed by Transtu.