It’s a pointed debate of the moment: How will travel get reshaped when the coronavirus crisis gets resolved?

Warren Buffett, chairman of Berkshire Hathaway, didn’t precisely wade into the discussion about which travel sectors might have an edge, but he made it clear in his annual address to shareholders Saturday that he’s not betting on airlines resembling their former selves in the next few years.

Buffett said Berkshire Hathaway has sold all of its shares in United, Delta, American and Southwest, stakes worth billions of dollars, CNBC reported.

“The world has changed for the airlines,” Buffett said, according to the CNBC story. “And I don’t know how it’s changed and I hope it corrects itself in a reasonably prompt way. I don’t know if Americans have now changed their habits or will change their habits because of the extended period.”

The Berkshire Hathaway chairman mused that passengers in the next three or four years may not log as many flying miles as they did last year — before the pandemic.

Buffett said Berkshire Hathaway sold all its airline shares in a block, as is its custom, rather than merely paring down its stock positions. He added that all four airlines have “excellent CEOs.”

In 2016, Berkshire Hathaway had reversed its longtime distaste in airline investing when it bought shares in the four largest U.S airlines, and now the company has done an about-face again.

“When we bought [airlines], we were getting an attractive amount for our money when investing across the airlines,” he said. “It turned out I was wrong about that business because of something that was not in any way the fault of four excellent CEOs. Believe me. No joy of being a CEO of an airline.”

Will Online Travel Agencies Be a Weak Link?

While Berkshire Hathaway placed its bet that U.S. airlines won’t revert to form for years, The Wall Street Journal on Saturday ran a story entitled Postvirus, Travel’s Middlemen Could Bear New Weight.

The Wall Street Journal story shows how the big public online travel companies —Booking Holdings, Expedia Group and Tripadvisor — have seen their share prices plummet 36 percent, on average, since January 1, and cites Airbnb as being in free-fall, as well.

Like Buffett, the Wall Street Journal argued that travel behavior may look different post coronavirus: Airlines are blocking off middle seats, and Airbnb is enforcing home downtime for cleaning with no guests allowed for 24 to 72 hours between stays.

There is also some evidence that some countries that recovered from coronavirus relatively quickly may blacklist still-recovering countries’ travelers from obtaining tourist visits.