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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 American Airlines President Robert Isom. American rose 3% in the premarket.
AutoZone (AZO) – The auto parts retailer reported a quarterly profit of $25.69 per share, beating the consensus estimate of $20.87. Revenue also beat estimates, with
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