CHENNAI, Aug. 16:The international airports unit of the Airports Authority of India (AAI) plans to add 25,670 sq metre area to the Anna International Terminal. This envisages accomodation of 18 airline check-in counters, 8 immigration and four customs counters in departure area and 10 immigration counters and 25 customs counters in the arrival hall. Two bagge delivery conveyor belts would also be added for arriving passengers.