A document, inviting expressions of interest, was released on Monday.

It says that any bidder would have to take on around $3.2bn (£2.4bn) of debt along with other liabilities.

The announcement comes more than a year after a bid to sell a controlling stake in the airline did not attract buyers.

The divestment of Air India has been a key agenda of the Indian government, which has been trying to offload loss-making companies and improve its balance sheet in the face of the slowest economic growth in a decade.

For years, Air India has blamed high aviation fuel prices, high airport usage charges, competition from low-cost carriers, weakening of the rupee, as well as a high interest burden for its poor financial performance.

What is the government offering?

Most significantly, it is offering a 100% stake in the airline. In 2018, it only offered potential buyers a 76% stake in the business. This was seen as a factor that put off potential buyers at the time.

"This is a very welcome change from last time to entice private players to bid for the carrier," Jitendra Bhargava, former Executive Director of Air India and author of the book, The Descent of Air India, told the BBC's Nikhil Inamdar.

Air India has 146 aircraft and owns 56% of its total fleet. It is also known to have lucrative international and domestic landing and parking slots. But the carrier has continuously lost market share over the last decade as it saw growing competition from low-cost rivals. The airline has a large debt overhang, with liabilities exceeding over $8bn.

But bidders will be expected to take on debt only to the tune of $3.26 billion according to the new terms. It is not yet clear what the government will do with the remaining debt.

"This could be a challenge because it is a very large portion of the debt to be taken care of when you consider that they have repayment schedules over eight to 10 years on around 70 aircraft," said Mahantesh Sabarad, head of Retail Research at SBICAP Securities. "Buyers will also need to infuse substantial funds into the airline, so we expect the start-up costs for anyone getting into this to be high."

Experts are also concerned that restructuring Air India's employee base of 14,000 plus people could be a challenge.

"I am concerned that the government hasn't reached out substantively to its critics, which includes employee unions and politicians," Mr Bhargava said.

The Economic Times newspaper has already reported that some of the employee unions are holding a meeting in Delhi later today to discuss the move.

A brief history of Air India

1932: Tata Sons, helmed by business tycoon JRD Tata, launches Tata Airlines

1946: It becomes a public company and is renamed Air India

1948: The government of India acquires a 49% stake in the carrier

1953: The government nationalises Air India

2007: Air India merges with Indian Airlines, a government-owned airline which only operated domestic routes

2007-08: Air India posts a net loss of 334mn rupees ($4.6mn; £3.5mn)

2018: An attempt to sell a 76% stake in the airline attracts no bidders

2019: Air India posts a net loss of 12.8bn rupees, its highest since the merger in 2007