Atatürk Airport is the main international airport for the city of Istanbul, and is in fact the largest airport in the whole of Turkey and one of the busiest in Europe. The airport was opened in 1924 and is located in the Yeşilköy district of the city, about 24 kilometres (15 miles) west of the city centre. Despite the newer Sabiha Gökçen International Airport helping to reduce the load on Atatürk Airport, the older airport still has trouble coping with the very high demand placed upon it. For this reason, a new Istanbul Airport is under construction and when completed, Atatürk Airport will be closed. In the meantime, Atatürk Airport still serves as the main hub for international carrier, Turkish Airlines, and has several options for travel from to and from the airport into the city. Istanbul Metro Line M1A connects to the city and is an extremely affordable way to travel. There are also municipal buses and specialised airport shuttle services.