Dubai is pumping $35 billion into building what it says will be the world's biggest airport

• Dubai wants to build a $35 billion airport with 400 gates and five runways in the next 10 years.
• The emirate says the facility's capacity will hit 260 million passengers, the most in the world by far.
• It's the centerpiece of the ambitious Dubai South, the emirate's planned city of 1 million people.

Dubai is undertaking a massive expansion of an airport that it plans to be five times the size of its current international hub.