In November, Don Mueang Terminal 1 would become the base for all international flights while the renovated Terminal 2 would become the domestic facility. Third-phase development would include another domestic terminal as well as a warehouse and an aircraft-maintenance facility, Mr Nitinai said.
AoT is inviting private-sector firms to join in the third-phase project. The airport operator said it could either do all the expansion itself and let an airline partner run the terminal, or airlines could bid on both the renovation and operation.
Mr Nitinai said Thai Smile, a subsidiary of Thai Airways International, is interested in both.