The two-year contract has an estimated value to Hill International of RO41.8mn, the company said in a press release issued on Tuesday on its website.
Hill International will replace COWI Larsen, whose services were terminated as per the decision taken by MoTC. The decision provides that COWI Larsen will discontinue its services from December 31.
The expansion of Muscat International Airport includes a new terminal that will have a capacity of 12mn passengers annually.
The expansion of Salalah Airport, the second largest in Oman, involves upgrading it from primarily a domestic airport to make it more suitable for international travellers, including building a new runway long enough to handle the A380 Airbus, and a new terminal that will improve the airport's capacity to 1mn passengers annually.
"Expansion of Oman's two largest airports is important for the sultanate's growth as a commercial and tourism destination in the Middle East," said Mohammed al Rais, senior vice president and managing director (Middle East) for Hill's project management group in the press release.
"We are honoured to have been selected to manage such important aviation projects," added Rais.
Hill International, with 3,300 employees in 110 offices worldwide, provides programme management, project management, construction management and construction claims and consulting services.