Warren Buffett's Berkshire Hathaway has bought stock in Atlanta-based Delta Air Lines, according to a regulatory filing.
The billionaire's firm now owns $249.3 million worth of Delta shares, according to the filing with the U.S. Securities and Exchange Commission.
Delta shares closed at $47.47 on Monday and were up more than 2 percent in after-hours trading.
Berkshire Hathaway also disclosed it has purchased shares of American Airlines and United Airlines. And Buffett, known as the Oracle of Omaha, told CNBC that he has also bought shares of Southwest Airlines.
It's an unusual turn of events for airline stocks, which have gone through a roller-coaster of volatility for years.
In a written statement, Delta said it "welcomes new investors as we continue to build a model for sustainable, long-term success as a high-quality global company that consistently produces solid returns."