Alitalia went on the auction block on Wednesday, as Italy kicked off the process of finding a buyer to save the money-losing flag carrier.

In a document signed by government-appointed commissioners, Alitalia said offers from single companies or consortia had to be presented by June 5. Bids could be to buy the whole company, restructure it, or acquire assets and contracts.

Alitalia was put under special administration earlier this month for the second time in less than a decade after workers rejected its latest rescue plan.

Rome has ruled out re-nationalizing Alitalia, once a symbol of Italy's post-war economic boom, which is struggling to compete at home against low-cost carriers and high speed trains. It has not invested sufficiently in higher-margin long-haul routes to revive profits.

The government appointed three commissioners to assess whether Alitalia can be restructured or liquidated, and has given them six months to come up with a plan.

Rome also threw the airline a short-term lifeline with a bridge loan of EUR600 million to see it through the process.

As of Feb. 28, the airline had debts of around EUR3 billion, liabilities of EUR2.3 billion and assets of EUR921 million.

Alitalia's balance sheet will be scrutinized over the summer by the three commissioners, who have promised to devise a new industrial plan by July.

They have said that the airline's above-market costs, especially for leasing, fuel and maintenance, have to be slashed to attract buyers.

Rival airlines including Lufthansa, Norwegian Air, Air France-KLM have shown no interest in buying Alitalia. Local media have cited Qatar Airways as one of the few potential buyers. The Gulf carrier has declined to comment.

Former Prime Minister Matteo Renzi, who regained the leadership of the ruling Democratic Party in April, is using his international contacts to help find a potential partner, a source told Reuters.

Non-EU players cannot own more than 49 percent of a European airline, which limits an investor's ability to run a carrier and discourages buyers.

Italian Transport Minister Graziano Delrio said this week that the limit was "unrealistic" and that talks to overcome the cap were at an advanced stage.

EU legislation is unlikely to be changed in time to help Alitalia, for whom the commissioners hope to secure binding interests by October.