Barclays, Overweight, $55 Target
Sanford Bernstein, Market Perform, $51 Target
JPMorgan, Overweight, $50 Target
Credit Suisse, Underperform, $40 Target
Even the Oracle of Omaha can change his mind: Warren Buffett's conglomerate has moved back into airline stocks, with stakes in American, United Continental and Delta. Plus, what Cramer thinks.