BIGGER HUB AOT expanding airport Airports of Thailand Plc(AOT) has signed three contracts worth 14.9 billion baht to expand Su- varnabhumi airport as the government gears up efforts to turn Thailand into the region's aviation hub, authorities said on August 26. The first contract, worth 12 billion baht, involves Italian-Thai Development Plc, hired to construct a concourse, parking bays and a tunnel in the airport's southern zone. The second contract, worth 1.98 billion baht, concerns SG and Interlink Consortium, employed to set up the utility system.