IN PICS: World's largest airport 'under one roof' to open in Istanbul

The airport has been envisioned to have a total capacity of up to 200 million passengers, once all four phases are completed in the next 10 years. (Photo by BULENT KILIC / AFP)

Overall the first phase has costed 7.5 billion Euro. It has been constructed by - IGA - which is a consortium of companies under a public private partnership (PPP) model. (Photo by BULENT KILIC / AFP)

Air transport operations would be shifted from capacity-constrained Atatürk Airport to the new facility by December-end. (Photo by BULENT KILIC / AFP)

Besides the inauguration, the new infrastructure facility after Atatürk Airport and Sabiha Gökçen Airport both in Istanbul will be named on October 29 which marks the Republic Day of Turkey. (Photo by BULENT KILIC / AFP)

Dubbed as phase-1A of the project - Istanbul New Airport - will have a capacity to handle 90 million passenger per year, making it the largest such facility in the world. (Photo by BULENT KILIC / AFP)

The world's largest airport terminal under one roof with a capacity to serve 90 million passengers will be officially opened on October 29 in Istanbul, Turkey. This handout picture made available on October 3, 2018 by Istanbul Grand Airport press center shows the new airport building. (Photo by HO / ISTANBUL GRAND AIRPORT PRESS CENTER / AFP)