\r\nThe 15-station section of Line 9 is El Prat's second rail connection after the existing suburban line, and the first to serve both of the airport's terminals. It also connects the airport with the Fira de Barcelona, a major exhibition venue, just in time for the Mobile World Congress, which will be held at the venue later this month.\r\nTrains operate at seven-minute headways with a journey time of 32 minutes between Zona Universit\u00e0ria and the airport. The line serves three municipalities - Barcelona, l'Hospitalet de Llobregat and Prat de Llobregat - and ridership is expected to reach 23 million passengers per year.\r\nBarcelona Metro is using 14 of its driverless Alstom series 9000 trains, which have a maximum speed of 80km\/h and operate at a commercial speed of 37km\/h on the new line.\r\nThe new section is branded Line 9 South as it is isolated from the 11km-long northern section of the line from Sagrera to Can Zam (and Line 10 to Gorg), which opened in 2010. Lines 9 and 10 are both part of a single project started in 2002 to create a 48km north-south link in the western part of the city, with a total investment of more than \u20ac16bn. Works to complete the remaining central section between Zona Universit\u00e0ria and La Sagrera have been delayed due to budgetary constraints.\r\nA single ticket to the airport costs \u20ac4.50, including a \u20ac2.35 surcharge. According to the local passenger watchdog Promoci\u00f3 del Transport P\u00fablic (PTP), suburban rail will remain the fastest option to reach the airport from the city centre, using Line 9 as a shuttle between terminals.\r\nCurrently, Rodalies suburban trains from Barcelona only serve Terminal 2, although construction is underway on a 4.5km line branch with a 3.8km tunnel beneath one of the runways, which will enable a new airport express service to serve both terminals.