Name: Safdarjung airport
passenger numbers: 15 million approx.
runway length: unknown. No sources found on google, (requesting help from data collectors)
co-ordinates:28.5844° N, 77.2058° E
Unfortunately, I couldn't find any source for the runway length and the passenger count is estimated. I hope you will understand that there are indeed no sources for this airport that I have found, not even wikipedia, but that doesn't count.