* Consortium has approached banks for advisory role - sources

* Abu Dhabi-owned Invest AD has largest stake in venture at 38 pct

* Passenger capacity at Queen Alia Airport to hit 9 mln with new terminal

* Parties have invested $850 mln for expanding airport

By Dinesh Nair

DUBAI, Jan 28 (Reuters) - An Abu Dhabi-led consortium investing $850 million to expand Jordan's main airport is looking to exit a 25-year concession to manage the facility, preferring to cash in the investment rather than stay involved for coming years.

Three banking sources told Reuters Airport International Group (AIG), formed of French, Greek and Jordanian firms to expand the Queen Alia International Airport with an additional terminal, had approached banks to advise on the possible sale.

The consortium was awarded a 25-year build-operate-transfer (BoT) concession by the Jordanian government in 2007. The new terminal is expected to open in February, increasing capacity nearly three times to 9 million passengers a year.

"They (the consortium members) have finished almost all the work and as financial investors, are looking to get out of the investment. The process is still at an initial stage and it will be a while before any deal is reached," one of the sources said.

Yet the potential withdrawal of an Abu Dhabi-led consortium is likely to be a sensitive development given the UAE's support for Jordan, a monarchy which is grappling with dwindling foreign investment in its ailing economy, amid the Arab Spring unrest.

Arab uprisings have hit Jordan's domestic demand and foreign cash flows, including remittances from expatriates in the Gulf, but air passenger traffic in the country has increased amid unrest in neighbouring Syria.

Queen Alia airport, the main hub for Royal Jordan Airlines

RJAL.AM , already has three terminals and more than 90 percent of work expanding it is complete, the sources said, speaking on condition of anonymity as the matter is not public.

The AIG consortium is led by Abu Dhabi-owned Invest AD, which has a 38 percent stake, and Kuwait's Noor Financial Investment Co NOOR.KW , with a 24 percent ownership.

LOOKING TO EXIT

Other partners include Jordan's Edgo Group, Greek construction firm J.P. Avax AVAr.AT , J&P Overseas Ltd and a unit of France's Aeroports de Paris Group ADP.PA .

A spokeswoman for AIG declined comment. Invest AD, Noor Financial and Edgo Group were not available for comment. ADP, which has a 9.5 percent stake in the venture, declined comment.

Invest AD's role in the venture is part of its infrastructure business, which it operated as a joint venture with Swiss lender UBS UBSN.VX , a second source said. The venture was scrapped in 2010 and the firm has been looking to exit, the source added.

A new buyer will be taking charge of a much larger airport with increased traffic after the expansion.

"It's not a massive airport now but after the expansion, you are talking about a sizeable one. Traffic is only likely to increase further given issues in countries like Syria," the source said.

Potential buyers could range from regional sovereign wealth funds that have a heavy focus on infrastructure, as well as global infrastructure investors. Saudi Arabia, which has proposed inviting Morocco and Jordan into a so-called club of kings with Gulf monarchies, might also lend its support.

Invest AD is owned by Abu Dhabi Investment Council (ADIC), which focuses on countries closer to home and is a separate entity from Abu Dhabi Investment Authority (ADIA), one of the world's largest sovereign wealth funds.

Noor is the financial arm of Kuwait's National Industries Group NIND.KW , controlled by the high-profile Kharafi family.

(Additional reporting by Sulieman Al Khalidi in Amman and Christian Plumb in Paris; Editing by Amran Abocar and David Holmes)

((dinesh.nair@thomsonreuters.com)(+ 971 4 366 4265)(Reuters Messaging: dinesh.nair.reuters.com@reuters.net))

Keywords: JORDAN AIRPORT/EXIT