Warren Buffett has taken an unexpected stake in four major U.S. airlines. According to regulatory filings, his holding company Berkshire Hathaway (BRK.A, BRK.B) invested $1.2 billion in American Airlines (NASDAQ:AAL), Delta (NYSE:DAL), United Continental (NYSE:UAL) and Southwest (NYSE:LUV). The Sage of Omaha did not share his rationale behind the trades, but he has long been bearish on the sector. In 2013 he described the industry as a “death trap”.
