A 95% plunge in passengers. Billions in losses. A rush for new debt. A recovery that executives expect to take years. Coronavirus is roiling the airline industry and the Oracle of Omaha has seen enough. Warren Buffett told investors Saturday that Berkshire Hathaway has sold its entire stakes in the four largest U.S. airlines — American, Delta, Southwest, United — as the pandemic upends another bet on the sector that the famed investor had shunned for years before a surprise return in 2016. “And it turned out I was wrong about that business because of something that was not in...