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3/17/15: Shares of domestic airline giant American Airlines (Nasdaq: AAL) jumped more than 5% this morning on news the company will be joining the S&P 500. American Airlines will take the place of Botox-manufacturer Allergan Inc. (NYSE: AGN), which is in the process of being acquired by pharmaceutical giant Actavis Plc. (NYSE: ACT) on the index. The addition will take place after the close of trading on March 20.