Buffett's Berkshire bulks up investments in American, other airlines, Apple
Warren Buffett's Berkshire Hathaway Inc. sharply increased bets on airlines and iPhone maker Apple Inc. in the fourth quarter, while taking a stake in seed provider Monsanto Co. Berkshire's investments in American Airlines Group Inc., Delta Air Lines Inc. and United Continental Holdings Inc. climbed to more than $2 billion each, according to a regulatory filing Tuesday from Buffett's Omaha, Neb.-based company.
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