MASSIVE PLAN AOT working on a master plan to develop the airport in line with growth in the aviation industry, Nitinai said after an even to celebrate the company's 36th anniversary. "We expect to company the master plan by early next year," Nitinai said. under the plan, AOT will invest between 130 -140 billion baht over five years in the airport .Suvarnabhumi airport is currently capable of handling 45 million passengers a year and Don Mueang Airport can serve 18.5 million .AOT plans to increase those numbers to 80 million and 30 million respectively, within four to six year.