Warren Buffett dumped the 'big 4' airline stocks in April. They've already recovered from the sell-off he sparked.

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· *Warren Buffett's exit from the "big four" airlines sparked a sell-off of their shares in early May.*
· *Shares in American, Delta, Southwest, and United have erased those losses and now trade above their average price in April, when Buffett ditched them.*
· *Buffett sold the airlines because he wasn't sure that...