These bets helped Warren Buffett become biggest-gaining billionaire of 2016 By: MarketWatch December 28, 2016 at 14:02 PM EST Buffett’s decision this year to get back into airline stocks is looking pretty smart right now. Read More >> Related Stocks: American Airlines Gp American Express Berkshire Hathaway Charter Communications Inc Coca-Cola Company Delta Air Lines Goldman Sachs Group Kraft Heinz Company M&T Bank Microsoft Southwest Airlines U.S. Bancorp Wells Fargo