Donald Trump says Warren Buffett makes a mistake selling airline stocks

(Reuters) - U.S. President Donald Trump on Friday said Warren Buffett, often regarded as the world's greatest investor, made a mistake by recently exiting a multi-billion dollar investment in the airline industry.Trump made his assessment at the White House, shortly after the U.S. Labor Department reported an unexpected surge in May jobs, and five weeks after Buffett said his Berkshire Hathaway Inc sold its airline stakes."Warren Buffett sold airlines a little while ago," Trump said. "He's been..