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Check out the companies making headlines before the bell:American Airlines (AAL) – Chief Executive Officer Doug Parker announced he would step down from that job on March 31 and remain as chairman. He'll be replaced as CEO by current…

NEW YORK: Stocks that traded heavily or had substantial price changes Tuesday:ConocoPhillips, up $2.26 to $59.33.The oil company is buying Shell’s Permian Basin assets for $9.5 billion.Lennar Corp., down 53 cents to $97.77.The homebuilder…