The trains run on the lower level, where there is a 16-metre (52 ft) island platform featuring screen doors.

[2] In March 2012, however, the Government of Catalonia announced that the opening date for the 20-kilometre (12 mi) section of the line between the airport terminals and Zona Universitària station would be postponed until 2014.

[3] In June 2014, the government announced that the section, apart from the Airport Terminal de Càrrega, La Ribera and Camp Nou stations, would open in the first half of 2016.

Multiple-use tickets and unlimited passes issued by the Autoritat del Transport Metropolità (ATM)—a public agency in charge of coordinating public transportation operators in the Barcelona area—are valid, with the exception of the T-10 ten-trip ticket.

There is also a project to extend Barcelona Metro line 2 (L2) southwards using the route of the L9 between Parc Logístic and Aeroport T1 stations.