DUBAI  - Oman Aviation Group is seeking to raise up to $6 billion to finance the expansion of state-owned Oman Air and Oman Airports up until 2030, its chief executive said on Tuesday.

Request for proposals have been issued to local and international banks and the first tranche is expected to be raised by mid-2020, Mustafa al-Hinai told Reuters in a phone interview. The planned financing would be spread over several tranches.

Government entity Oman Aviation Group was formed in February 2018 and includes Oman Air, Oman Airports and Oman Aviation Services.

"To promote growth we are working on a master development across all our airports. We are looking to develop airport cities which we will require financing for," Hinai said.

"The second thing we are looking for is expansion after 2023 for our airports and our airline."

Oman Airports operates and manages four airports in the country, including Muscat International which is the base of Oman Air.

A new $1.8 billion terminal opened at Muscat last year which handled 18 million passengers in 2018 and is forecast to handle 40 million a year by 2030, Hinai said.

Oman Air has 20 Boeing 737 MAX and four 787-8 aircraft on order, according to Boeing's website, which will require financing.

Hinai said Oman Air would not be ready for privatisation until its restructuring is completed and that there are no plans to privatise Oman Airports.

A year ago, Oman Air Chief Executive Abdulaziz al-Raisi told Reuters the airline would potentially break even by 2021, four years later than initially planned.

The government of Oman expects to raise a total of around $6.2 billion in domestic and foreign debt this year, according to its 2019 state budget.

Oman, which is less wealthy than its oil-rich Gulf neighbours, is relying increasingly on borrowing to offset a widening budget deficit caused by a slump in oil prices.

(Reporting by Alexander Cornwell, editing by Louise Heavens and Jason Neely) ((Alexander.Cornwell@thomsonreuters.com;))