The city of Istanbul, Turkey, plans to build what it calls the biggest airport in the world, capable of handling 150 million passengers a year. Altanta's Hartsfield-Jackson international Airport, currently the world's busiest, serves about 90 million per year. The U.S.$9.13 billion project will include six runways and cover nearly 829 million square feet of land near Istanbul. Plans call for the first of four stages to be completed in 2017, at which point the airport will open for business with a passenger capacity of 90 million per year. Ataturk International Airport, on Istanbul's European side, currently serves approximately 45 million passengers annually, while the smaller Sabiha Gokcen, on the city's Asian side, handles about 15 million yearly. Plans for the existing airports, which might include turning one into a cargo facility, have yet to be finalized.