And from Delhi Kindly proceed to Bangalore Sir.This will be good for your own knowledge on aviation in India.
Bangalore International Airport - Airport Technology
And from Bangalore kindly proceed to Kolkata Sir.Its a long way but knowledge is never easy to acquire.
Key airport upgrade nears finishing line - Kolkata - City - The Times of India
After you have rested in Kolkata,I will tell about more places Sir.Over and Out.