(Bloomberg) — Boeing Co. is planning to launch a capital raise as early as Monday, according to people familiar with the matter, in an offering that would help the beleaguered airplane maker boost its liquidity.

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The company is set to raise more than $15 billion from the fundraising, one of the people said, adding that the amount could still rise depending on demand. Boeing’s advisers have been lining up potential investors for the offering, according to people familiar with the matter, who asked not to be identified as the information isn’t public.

The transaction is likely to include shares as well as debt that can be converted into equity, the people said.

The company on Oct. 23 received clearance from the US Securities and Exchange Commission to sell as much as $25 billion of equity and debt, a move that could help Boeing avoid having its credit rating downgraded to junk.

Deliberations are ongoing and details of the offering, such as timing, could still change, the people said. A Boeing representative declined to comment.

A $15 billion share sale would be the largest equity offering since SoftBank Group Corp. sold part of its stake in T-Mobile US Inc. in 2020, data compiled by Bloomberg show.

Boeing needs the capital infusion to maintain its investment-grade rating and fund its eventual recovery from a crippling strike, now in its seventh week. The company is on pace to use around $4 billion in cash during the fourth quarter, which would bring its free-cash outflow to around $14 billion for the year. The planemaker expects to continue burning cash through the first half of next year as it restarts its airplane factories, including the assembly lines for its cash-cow 737 Max jetliner.

Boeing factory workers voted last week to reject the company’s latest contract offer, which included a wage increase of 35% spread over four years. The company plans to cut its workforce by about 10%, with reductions potentially including executives, managers and employees, Chief Executive Officer Kelly Ortberg said in a memo to employees Oct. 11.

Boeing was weighing raising at least $10 billion by selling new stock and was working with advisers to explore its options, Bloomberg News reported earlier this month. Bank of America Corp. analyst Ronald Epstein on Oct. 23 estimated the company would raise between $18 billion and $20 billion.

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