A brand new airport. Not a new terminal. Chattrapati Shivaji International Airport simply doesn't have the runways and tarmac to become a 50+ million pax/yr airport, and it's already clocking 42 million. This is a recipe for disaster, especially with the intersecting runway design of the airport, and its ATC being unable to handle more than 40 movements/hr. Heck, as if that isn't bad, CSIA doesn't even have land to implement its own development plan. There isn't even enough land to build Terminal 2's second radial concourse. To prove that CSIA doesn't even have the land for T2's second radial concourse, I selected the first radial concourse in Photoshop, flipped in horizontally, made the layer 50% opaque, and tried to overlap it where CSIA's planners hoped to build the second radial concourse. See what happens? Half the concourse and its tarmac/apron are completely outside CSIA land, and even over a storm drain which floods each monsoon! What the fuck were the planners thinking?!? The best bet is to build a proper H-type or N-type airport elsewhere. Maybe it has to eat into some of the forest near Kandivali East, or dredged out mangrove land near Vikhroli, or even the Indian mainland. But this city needs a brand freaking new airport with enough land to keep it expanding till it serves 100 million pax/yr. Hyderabad is nowhere in the league of Mumbai in terms of passenger movements, but at least the government allocated the current airport enough land to keep it ticking till 2035.