The humongous steel and glass terminal extends over 5.4 million square feet, has 78 gates or aero-bridges, 97 automatic walkways and five-level baggage screening system with a capacity to handle 12,800 bags per hour, 215,000 square feet of retail space and parking for 4,300 cars in a multi-level building connected to T3 with covered walkways.
T3 has nine parking slots for the world's biggest double-decker Airbus A380 plane, six more than Heathrow.
Covering 20 acres, T3 is the largest public building, with a length of 1.2 km end to end, constructed since India's independence in 1947.
T3 was completed in 37 months by GMR compared with the 45 months China took to build the terminal in Beijing before the 2008 Olympics.
Costing $2.7 billion, it can handle 75 planes in an hour with the latest Cat III runway landing system and 97 moving walkways.
T3 became operational with the first Air India flight from New York with a big load of NRIs zapped into the new terminal.
Image: The automatic walkways at the Terminal 3.