Line A (Czech: Linka A) is a line of the Prague Metro, serving the Czech capital. Chronologically the second line in the system, it was first opened in 1978 and has expanded mostly during the 1980s. With the opening of the extension to Nemocnice Motol on 6 April 2015, Line A operates on approximately 17.1 kilometres (10.6 mi) of route and serves 17 stations. An extension with a further five stations to the airport is currently planned.
Construction of the first segment started in 1973, part of this segment was also a tunnel connecting this line with the already existing Line C between Muzeum and Náměstí Míru stations. After completion of the second section, work was started on the extension to the new metro depot at Hostivař. The 3.4 kilometres (2.1 mi) long tunnel was completed in 1985, and the second tube in 1987 with the new station Strašnická on that line. In 1990 Skalka station was opened, again on that line, and in 2006 Depo Hostivař station was opened, built in a former wash-stand of the depot.
Tunnel between Petřiny and Motol stations under construction, 2011
The first phase of a CZK18.7 billion extension on the west end of the A line, from Dejvická to Nemocnice Motol, was opened to the public on the afternoon of 6 April 2015. The second phase of this extension will see the line reach Prague Václav Havel Airport. Finally this phase has not been approved and Airport will be serviced by train only.