(Bloomberg) — Two battered giants of the travel industry — Carnival Corp. and American Airlines Group Inc. — are taking advantage of the coronavirus vaccine rally to sell stock.Carnival, the world’s biggest cruise company, filed to sell as much as $1.5 billion in stock after its shares surged on Monday. American Airlines separately priced an offering of about $500 million in common stock at $13 per share, people familiar with the matter said.The moves come at an opportune moment: Investors in both companies are optimistic that a Covid-19 vaccine could lift their fortunes. For Carnival, Monday’s gain was the biggest one-day increase ever. Still, the stock remains down about two-thirds this year — and the downward slide resumed on Tuesday.In a filing Tuesday, Carnival said it would raise money for general corporate purposes. The Miami-based company recently completed the sale of 67.1 million common shares under a similar program.Cruise companies are trying to convince regulators and consumers that cruising is safe, but the industry may face an uphill battle until a vaccine is widely available. Anticipation of the shares getting diluted also weighed on the stock Tuesday. The shares fell as much as 12% to $16.91 in New York trading.American Airlines also slid Tuesday, falling as much as 5.3% to $12.50. It’s down 56% this year.Separately, Norwegian Cruise Line Holdings Ltd. Chief Financial Officer Mark Kempa said on a conference call Tuesday that the company would look at potential capital raises “on an opportunistic basis,” while adding that he had a “solid runway” of cash and wasn’t in a rush. Kempa said the potential moves could include raising money in the equity market.To shore up their coffers amid the pause in operations, cruise companies have already had to sell equity stakes for cheap and pay unusually high interest rates on new debt.Last month, a conditional order from the U.S. Centers for Disease Control and Prevention created a pathway for cruise lines to return to U.S. waters. But companies will need to first prove that cruising is safe.For more articles like this, please visit us at bloomberg.comSubscribe now to stay ahead with the most trusted business news source.©2020 Bloomberg L.P.