Istanbul Airport, Turkey's newest airport, has been officially opened. The airport will be able to handle up to 90 million passengers by 2021.
Further expansion will lead to a total capacity of up to 200 million, nearly twice the capacity of the world's busiest airport last year, Atlanta.
Istanbul's existing Ataturk Airport will continue to operate as normal until the end of the year, when it will transfer its international code - IST. Istanbul's other, smaller airport, Sabiha Gokcen, is expected to remain operational into the foreseeable future.
President Recep Tayyip Erdogan officially opened the airport on Monday to coincide with the 95th anniversary of modern Turkey's foundation, and the associated public holiday, Republic Day.
The $12bn (€10.6bn) project has been spearheaded under Mr Erdogan's government, which envisions Istanbul becoming a global transit hub between Asia, Africa and Europe.
But the airport has not been without controversy - at least 30 workers have died during its construction.