Spain's capital city Madrid has a ￡151million plan to extend one of its metro lines in a move aiming to benefit 62 million passengers.

       Madrid wants to extend it Line 5 Metro to the city's airport in a scheme costing ￡151million (€180.9m).

       Once complete, the extension will connect Alameda de Osuna with Adolfo Suárez Madrid-Barajas Airport.

       Spanish authorities revealed on Wednesday (February 12) that works on the extension will start this spring and continue for 30 months.

       The mile long (1.7km) extension will include an interchange station with four platforms, two halls and cover a surface area of 5,000 square metres.

       Madrid expects the project to improve connectivity to the city centre and provide a new entrance to the airport via the network's fourth most busy line, Line 5.

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       This line connects the northeast and southwest, taking in 32 stations and transporting more than 77 million passengers annually, according to Spanish news website Voz Populi.

       The line currently measures 15.5 miles (25km) and includes stops in the centre of the city, including Gran Vía and Callao. It also connects with 10 other lines as well as Madrid's ópera-Príncipe Pío branch.

       Funded by the European Union, the project's backers say it will benefit the millions of people who pass through Spain's most important airport.

       They also say the extension will benefit the more than 40,000 people who work and live near Line 5.

       Adolfo Suárez Madrid-Barajas Airport currently has four terminals and two stations located in the flights hub - Aeropuerto T1-T2-T3 and Aeropuerto T4.